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        High plasma CD40 ligand level is associated with more advanced stages and worse prognosis in colorectal cancer

        2022-06-23 05:39:58ZoltanHeroldMagdolnaHeroldGyorgyHerczegAgnesFodorAttilaMarcellSzaszMagdolnaDankAnikoSomogyi
        World Journal of Clinical Cases 2022年13期

        lNTRODUCTlON

        According to the GLOBOCAN 2018 data,colorectal cancer(CRC)is the third most common cancer type with over 1.8 million new cases and causing more than 860000 deaths annually[1].Elevated platelet count(thrombocytosis)has been described previously as a poor prognostic sign in CRC[2].Thrombocytosis may arise in CRC due to the following:(1)Secondary thrombocytosis caused by the bleeding of the tumor;and(2)paraneoplastic thrombocytosis defined as a metabolic change caused by the tumor itself[2,3].In the latter,the elevated platelet count can be attributed to the overproduction of cytokines by the tumor,which induces hepatic thrombopoietin production and ultimately increases bone marrow activity[3,4].

        CD40 ligand(CD40L,synonym: CD154,gp39,or T-B activating molecule)is a type I transmembrane glycoprotein belonging to the tumor necrosis factor family of cytokines[5,6].CD40L activates CD40,a transmembrane protein receptor found on antigen-presenting cells[6].The majority of circulating CD40L is assumed to originate from platelets.A membrane-bound CD40L form is also known[6].CD40L has been described to have antitumor effects

        the inhibition of tumor cell proliferation and pro-apoptotic features through the activation of apoptotic pathways[6-9].It has been found previously that CRC patients have significantly higher soluble CD40L levels than those of healthy control subjects.Its possible use as a promising biomarker in CRC was proposed[10-12].The connection between CD40L levels and lymph node involvement or distant metastasis is controversial.One study reported increased CD40L levels in patients with worse disease conditions,while others have found the opposite.Furthermore,neoadjuvant chemoradiotherapy has decreased CD40L levels[10-12].

        As soon as he was sure that their wicked enemy was really dead, and could do them no further harm, Blacky started off to rescue Browny and Whitey. As he approached the den he heard piteous grunts29 and squeals30 from his poor little brother and sister who lived in constant terror of the fox killing31 and eating them. But when they saw Blacky appear at the entrance to the den their joy knew no bounds. He quickly found a sharp stone and cut the cords by which they were tied to a stake in the ground, and then all three started off together for Blacky s house, where they lived happily ever after; and Browny quite gave up rolling in the mud, and Whitey ceased to be greedy, for they never forgot how nearly these faults had brought them to an untimely end.

        The role of CD40L in the course of CRC and its relationship with CRC-related thrombocytosis has not been investigated previously.Therefore,a prospective observational study was carried out.Paraneoplastic thrombocytosis was investigated through the measurement of plasma interleukin-6 and thrombopoietin levels.In addition to the latter,the further aim of this study was to try to clarify the discrepancy between plasma CD40L levels and higher tumor stages.The effect of plasma CD40L on survival was also analyzed.

        MATERlALS AND METHODS

        The study was conducted in concordance with the World Medical Association’s Declaration of Helsinki.The study was approved by the Committee of Science and Research Ethics,Hungarian Medical Research Council(ETT TUKEB 8951-3/2015/EKU)and by the institutional ethical committees of Semmelweis University(SE TUKEB 21-12/1994,approval date of latest modification: February 10,2017)and Szent Imre University Teaching Hospital(SZIK IKEB 5/2017).Handling of patient data was in accordance with the General Data Protection Regulation issued by the European Union.

        The role of CD40L in neoplastic diseases is controversial[6].Cellular model studies have revealed that it can significantly contribute to the immunological activity against cancer,while other studies have reported the complete opposite,

        that CD40L contributes to the progression and growth of the tumor[23,24].The most promising results and antitumor effects have been observed in melanomas and hematological malignancies[6],including enhanced protection of dendritic cells against apoptosisinducing factors of tumor cells,enhanced maturation and antigen production of B cells,increased T celldependent immune response and the CD40L activation-dependent apoptosis of cancer cells[6].Moreover,CD40- and CD40L-based drugs have been developed recently,and active clinical trials are currently investigating their efficacy[25].

        Patients and study design

        A prospective,real-life observational cohort study was carried out,and a total of 106 CRC patients were enrolled for the study between 2017 and 2019.Fifty age and sex-matched control subjects were selected from a pool of 166 volunteers.Prior to any study-specific procedures,study subjects signed written informed consents.CRC patients attended the Department of Internal Medicine and Hematology,Semmelweis University,Budapest and the Department of General Surgery,Szent Imre University Teaching Hospital,Budapest.Control subjects attended the Metabolic Outpatient Clinic of the Department of Internal Medicine and Hematology,Semmelweis University,Budapest.Study exclusion criteria included age < 18 years,an Eastern Cooperative Oncology Group performance status > 2,previous malignancy,and systemic autoimmune,inflammatory bowel,inadequately controlled thyroid,hematologic,chronic kidney,or any mental diseases.The usage of erythropoiesis-stimulating agents or recent blood transfusion was also prohibited.In addition to the above,control subjects with any metabolic disease,except type 2 diabetes mellitus,which was present in several of the CRC patients,were excluded from the study.

        Clinicopathological and laboratory data measurements

        Body weight,height,and anamnestic data including comorbidities and recent medications were collected.Fasting blood samples were drawn:(1)At the time of CRC diagnosis;(2)at least 6 wk after tumor removal surgery;and(3)at least 6 mo after tumor removal surgery.Several chemotherapeutic agents are known to affect platelet count[13,14].Therefore,the third measurements were timed so that patients had not received any oncological treatment for at least 6 wk prior to blood sampling.Followups of patients were terminated on January 31,2021.Routine laboratory measurements were performed at the central laboratories of Semmelweis University and Szent Imre University Teaching Hospital.Complete blood count,liver enzyme,plasma glucose,and creatinine levels were determined.The Chronic Kidney Disease-Epidemiology Collaboration equations were used to calculate the estimated glomerular filtration rate[15].

        In addition to routine laboratory measurements,plasma CD40L,interleukin-6,and thrombopoietin levels were measured using the CD40L Human Enzyme-linked Immunosorbent Assay kit(ELISA kit,abcam

        ,Catalog Number ab99991,Cambridge,MA,United States),ELECSYS

        Interleukin-6 electrochemiluminescence immunoassay(ECLIA,Roche Diagnostics GmbH,Mannheim,Germany),and the Human Thrombopoietin Quantikine

        ELISA kits(catalog number: DTP00B,R&D Systems,Minneapolis,MN,United States),respectively.As per the manufacturer’s description,thrombopoietin level was obtained from platelet-poor plasma.

        The tumor-staging was given by histopathological examination of surgical specimens and imaging studies;the American Joint Committee on Cancer grouping was used[16].The side of CRC was described[17]as right-sided if the tumor was originating from the cecum,ascending colon,and proximal two-thirds of the transverse colon,while left-sided was described if the tumor originated from the distal one-third of the transverse colon,descending colon,sigmoid colon,and rectum.Chemotherapy was recorded as adjuvant if no distant metastasis by imaging was detected and as first-line,second-line,

        in metastatic CRC.The usage of biological agents was recorded as a dummy variable.

        Statistical analysis

        Statistical analysis was performed with R version 4.0.4[18].Matching of control subjects was done

        propensity score matching(R-package Matching[19]).Wilcoxon-Mann-Whitney

        -test,Fisher’s exact test,Kruskal-Wallis test with

        value corrected pairwise Wilcoxon-Mann-Whitney

        -tests as post-hoc,and Spearman’s rank correlation were used.To detect the changes of CD40L in time,linear mixedeffects models were used(R-package nlme)[20].Overall and CRC-related disease-specific survival of patients were analyzed with Cox regression and cause-specific competing risk survival models(Rpackage survival)[21],respectively.

        < 0.05 was considered as statistically significant,and

        values were corrected with the Holm method[22]for multiple comparisons problem.Results were expressed as mean ± SD and as the number of observations(percentage)for continuous and count data,respectively.

        When they reached it the Caliph turned to the owl, and said with much feeling: Deliverer of my friend and myself, as a proof of my eternal gratitude97, accept me as your husband

        RESULTS

        Baseline measurements

        A total of 106 CRC patients and 50 age and sex-matched voluntary control subjects were enrolled for the study.Baseline laboratory measurements and anamnestic data were summarized in Table 1,and histopathological data of CRC patients were summarized in Table 2.The two cohorts were well balanced as no significant difference was detected in either of the anamnestic data.On the contrary,most of the parameters of complete blood count within the CRC group were out of normal range(

        <0.05),and 12 of the 106 CRC patients(11.3%)showed signs of thrombocytosis(platelet count > 400 × 10

        /L).The plasma interleukin-6(

        = 0.0002)and thrombopoietin(

        = 0.0024)levels of CRC patients were significantly higher than those of the control subjects.CD40L did not differ between the two cohorts,but it should be highlighted that CD40L of control subjects was tendentiously lower(crude

        value: 0.2946;Figure 1).

        To test whether other factors,such as age,sex,body mass index,histopathological data,or the presence of comorbidities,affect plasma CD40L levels,further subgrouping within the individual cohorts and correlation analysis was performed.CD40L level of control subjects was affected by the presence of diabetes(without diabetes: 240.41 ± 207.37 pg/mL;with diabetes: 110.09 ± 112.06 pg/mL;

        = 0.0313),while no further parameters had any effect on the CD40L level of control subjects.In contrast,the presence of diabetes had no effect on CD40L levels of CRC patients(

        = 0.7377).The presence of regional lymph node metastasis alone was not associated with a higher CD40L level(

        = 0.7165),but the CD40L level was significantly higher in the presence of distant metastasis(M0: 228.27 ± 293.30 pg/mL;M1: 395.11 ± 322.00 pg/mL;

        = 0.0055;Figure 2A)and with thrombocytosis(without thrombocytosis:248.15 ± 299.20 pg/mL;with thrombocytosis: 475.77 ± 323.43 pg/mL;

        = 0.0294).

        Furthermore,a negative correlation was found between CD40L and mean corpuscular volume(Spearman’s ρ = -0.36,

        = 0.0048),marginal association with hematocrit(Spearman’s ρ = -0.28,

        =0.0898),mean corpuscular hemoglobin(Spearman’s ρ = -0.29,

        = 0.0801),and red blood cell distribution width(Spearman’s ρ = +0.29,

        = 0.0805).Higher platelet count was associated with more advanced stages of CRC(

        = 0.0079;Figure 2B),similar to those of CD40L levels.Right-sided tumors(left sided:300.97 ± 114.81 × 10

        /L;right sided 350.90 ± 141.27 × 10

        /L;

        = 0.0121)and the presence of distant metastasis(M0: 289.16 ± 107.69 × 10

        /L;M1: 385.72 ± 140.28 × 10

        /L;

        = 0.0006)were also associated with increased platelet count.Moreover,higher interleukin-6 levels were observed in patients with a higher stage range(

        = 0.0025;Figure 2C),with the presence of positive regional lymph nodes(N0: 7.03± 7.53 pg/mL;N1+: 15.82 ± 24.67 pg/mL;

        = 0.0400)and with distant metastasis(M0: 7.03 ± 8.66 pg/mL;M1: 21.88 ± 29.33 pg/mL;

        = 0.0005).Plasma thrombopoietin levels were basically equal in all stages except in Stage II,where decreased thrombopoietin levels were observed compared to the other stages(

        = 0.0210;Figure 2D).

        To further assess the effect of thrombocytosis on CD40L,general linear models were created.Thrombopoietin did not have any effect on CD40L.Higher platelet count or the presence of thrombocytosis and higher plasma interleukin-6 levels were strongly correlated with higher CD40L levels(Table 3).It should be emphasized that both the individual and combined effect of these parameters only slightly explained the increase in CD40L.The explanatory power of the models,based on adjusted R

        ,was at a maximum of 8.1%.

        Changes in CD40L with the course of the disease

        CRC patients were recalled for follow-ups,and 61 of the original 106 patients(call-back rate 57.4%)had at least one repeated measurement of CD40L and other laboratory parameters.Distant metastasis developed in an additional 14 CRC patients following the surgical removal of the primary tumor.Thirty CRC patients had all three sets of measurements(Figure 3).The mean durations between baseline and 6 wk after surgery and between baseline and > 6 mo after surgery were 2.07 ± 1.76 mo and 10.38 ± 3.73 mo,respectively.To determine whether CD40L or the parameters related to thrombocytosis change with respect to the course of CRC,linear mixed-effects models were constructed.A total of 197 measurements were used,where not only the paired but all the baseline and further repeated measurements from all the 106 study participants were used.Based on these estimations,a significant 1.5%-2.7% average decrease in platelet count can be expected per month(

        < 0.0001;Figure 3B),while no significant changes were observed in the plasma CD40L(

        = 0.6813;Figure 3A),interleukin-6(

        =0.4497),and thrombopoietin(

        = 0.2867)levels of CRC patients.

        The effect of regional metastatic lymph node or distant metastasis and thrombocytosis on plasma CD40L levels within the course of the disease was also assessed.After the surgical resection of the primary tumor,the CD40L level of CRC patients with distant metastasis(

        = 0.6964)or thrombocytosis(

        = 0.7829)did not change over time.The same increased level could be observed throughout the observation time(M1:

        = 0.0326;thrombocytosis:

        = 0.0008),as described at the baseline.The strong association between CD40L level and platelet count(

        = 0.0002)and interleukin-6 level(

        = 0.0012),observed at baseline measurements,also persisted throughout the whole time of the study.

        Survival analysis

        Overall and CRC-related disease-specific survival of patients was calculated.Patient follow-ups were terminated on January 31,2021.Thirty of the 106 patients(28.3%)died during the study.The three different causes of death were postoperative complications,infection,and CRC-related in 4 cases,1 case,and 25 cases,respectively.Both pre- and postoperative data had been analyzed;106 and 61 cases were used for the calculations,respectively.Patients with higher preoperative plasma CD40L level[hazard ratio(HR): 1.001,95% confidence interval(CI): 1.000-1.002,

        = 0.0159],plasma interleukin-6 level(HR:1.020,95%CI: 1.010-1.030,

        = 0.0001),and platelet count(HR: 1.003,95%CI: 1.001-1.005,

        = 0.0052)had significantly shorter overall survival,while preoperative plasma thrombopoietin level(

        = 0.5550)did not affect the overall survival of patients in univariate models.In a multivariate setting,interleukin-6had the most prominent effect on overall survival(HR: 1.024,95%CI: 1.010-1.039,

        = 0.0012),while CD40L(95%CI: 0.9995-1.0020)and platelet count(95%CI: 0.9996-1.0040)had a marginal effect.Thrombopoietin did not affect the overall survival of patients.The same was observed for preoperative(Figure 4)and postoperative(Figure 5)disease-specific survival.

        Limitations of the current study were the relatively small sample size and the 57.4% follow-up rate,which did not allow us further analysis,

        ,subgroup analysis or stratifications in survival models of postoperative measurements.Heterogeneity of the study population also introduced some bias.

        Using stratified survival models we could assume different preoperative baseline hazards for patients with or without thrombocytosis(platelet count > 400 × 10

        /L).In a univariate model,higher preoperative plasma CD40L level indicated poor disease-specific prognosis of CRC patients(HR: 1.001,95%CI: 1.000-1.002,

        = 0.0332).However,only a marginal effect was found in multivariate models(HR:1.001,95%CI: 0.9998-1.002,

        = 0.1196).Neither platelet count(univariate:

        = 0.3310;multivariate:

        =0.6237),nor thrombopoietin(univariate:

        = 0.9440;multivariate:

        = 0.5387)level affected patient survival if stratification by thrombocytosis had been applied.The strong effect of the inflammatory cytokine,interleukin-6 on survival could be demonstrated even by the elimination of the effect of thrombocytosis(univariate:

        = 0.0016;multivariate:

        = 0.0103).

        DlSCUSSlON

        This had happened so often that her subjects lived in terror of losing her altogether, and tried everything they could think of to keep her to the ground

        The CRC cell lines HCT116,Colo320,and Caco-2 have been shown to be positive for CD40,while SW480,HT29,Colo741,and LS174T do not express CD40[7,9,24].The treatment of CD40-positive cell lines with interferon-γ can further increase the expression of CD40[7].Analysis of resected tumor specimens has shown that approximately every third CRC is moderately or strongly CD40-postive[24].While in another study CD40- and CD40L-positivity has been observed in 79% and 56% of CRC patients,respectively[8].

        treatment of CD40-positive CRC cell lines with recombinant soluble human CD40L can inhibit tumor growth,induce apoptosis[7],inhibit CRC cell proliferation,stall CRC cells at the G0/G1 state,influence cell adhesion and metastasis,and increase aryl hydrocarbon receptor expression[8].While the T cell membrane bound CD40L can induce enhanced apoptosis of

        CRC cells with CD40-positivity[24],less signaling strength has been observed in the case of the soluble form of CD40L.Soluble CD40L can induce apoptosis only following specific pharmacological interventions[24,26].

        Previous clinical studies revealed that high CD40 expression and higher soluble CD40L concentration are associated with CRC[9,10],and these elevations are the most prominent with the presence of lymph node metastasis[7,10,27],venous invasion[11],and higher TNM stages[7,10,27].

        stimulation of CD3

        ,CD4

        ,and CD8

        T cells of CRC patients resulted in a significantly increased,approximately fourtimes higher,CD40L expression compared to those of healthy control subjects[28].

        High plasma CD40L levels of CRC patients are with high probability not only dependent on circulating platelet count.General inflammation caused by the tumor could also contribute to CD40L elevation;therefore,further studies are required to clarify this question.

        Our data showed that CD40L level is positively correlated with several markers of(paraneoplastic)thrombocytosis,in particular with platelet count and interleukin-6.This strong connection persisted throughout the whole observation period.It has to be mentioned though that the stratification used in our survival models should have fully eliminated the significant effect of CD40L on CRC survival.However,we could not demonstrate this expected effect,which was observed,

        ,in the case of platelet count.This,together with the weaker explanatory powers observed in our linear models,suggests that the increase in CD40L levels is possibly not only influenced by(paraneoplastic)thrombocytosis alone.Increased CD40L production is known in various diseases characterized by general inflammation,like atherosclerosis,diabetes,or inflammatory bowel disease[35-38].CRC can also be described as a disease known for its general inflammation[39],high interleukin-6 level[39],and inadequate T cell activation[27].Furthermore,increased inflammation is also associated with metastasis[40,41].The strong correlation between CD40L,interleukin-6,and metastases hints that the answer may be sought in the increased inflammation caused by the tumor or its metastases.To clarify this question,further investigations are needed.

        Approximately 95% of the soluble form of CD40L is thought to be derived from platelets[32,33].Soluble CD40L level is strongly correlated with platelet count[34].The highest levels can be measured in reactive thrombocytosis and essential thrombocythemia,while the lowest values can be measured in patients with low platelet count[34].Thrombocytosis is associated with several cancers[2,3],and the platelet count is higher in patients with metastasis[2].CD40L positively correlates with platelet count in patients with a high response rate to neoadjuvant chemoradiotherapy[11].An assumption was made by Huang

        [27]that in cancer patients soluble CD40L is most probably derived from activated platelets than from T cells.However,this question was never further investigated.

        Had he been walking north, away from the camp, toward the sea? He stood up and started slowly toward the ship, knowing full well the sick wolf was following him

        Limitations

        Quick, away with him, and off with his head! So the false slave was put to death, that none might follow in his footsteps, and the wedding feast was held, and the hearts of all rejoiced that the true bridegroom had come at last

        CONCLUSlON

        To summarize the results of the current study,our data suggested that,in line with some previous publications[7,10,27],the plasma CD40L level is significantly higher in CRC,and the highest levels could be observed in Stage IV cancer.CRC patients with thrombocytosis had significantly higher CD40L levels,and CD40L was strongly correlated with some of the parameters of paraneoplastic thrombocytosis.The CD40L level of patients did not changed during the disease.Results from our stratified survival models and their strong association with high interleukin-6 levels and distant metastases suggest that CD40L is not only dependent on platelet count/thrombocytosis.We hypothesize that the general inflammation caused by the tumor may also play a role in the CD40L elevation of CRC patients,with high probability.To clarify this hypothesis,further investigations are needed.

        ARTlCLE HlGHLlGHTS

        Research background

        The role of CD40 ligand(CD40L)is controversial in colorectal cancer(CRC).Higher circulating CD40L levels of CRC patients are known,but their relationship with disease staging and local and distant metastasis is not clear.

        Research motivation

        To our knowledge,no previous study investigated the relationship between CD40L and CRC-related thrombocytosis.Furthermore,no study was conducted to observe if CD40L changes with the course of CRC.

        Research objectives

        To analyze the clinical characteristics and laboratory results of 106 CRC patients and evaluate CD40L,interleukin-6,thrombopoietin level,and platelet count changes with the course of the disease;and to evaluate their effect on patient survival.

        Research methods

        CD40L and thrombopoietin were measured

        enzyme-linked immunosorbent assay and interleukin-6

        electrochemiluminescence immunoassay.Measurements were conducted at the time of CRC diagnosis,at least 6 wk after primary tumor removal surgery,and at least 6 mo after primary tumor removal surgery.

        Research results

        CD40L of CRC patients was significantly higher in the presence of distant metastasis and/or thrombocytosis.CD40L was constant with the course of CRC,and all baseline differences persisted throughout the whole study.Both pre- and postoperative elevated CD40L were associated with poor overall and disease-specific survival of patients.The negative effect of CD40L on patient survival remained even after the stratification by thrombocytosis.

        They cut Cassim s body into four quarters, and nailed them up inside the cave, in order to frighten anyone who should venture in, and went away in search of more treasure

        Research conclusions

        CD40L level of CRC patients does not change with the course of the disease.The CD40L level is strongly correlated with platelet count,interleukin-6,thrombocytosis,and the presence of distant metastases.The effect of CD40L on patient survival cannot be fully eliminated

        stratification by thrombocytosis.This suggests that the circulating amount of platelets is not the only factor behind its elevation.

        Research perspectives

        In contrast to the results above,Tada

        [11]and Lima

        [12]observed lower soluble CD40L levels within those CRC patients with worse clinicopathological features.To our knowledge,no previous study investigated CD40L levels with the course of the disease,and only partial data are available from the study of Tada

        [11].In that study,rectal cancer patients received neoadjuvant chemoradiotherapy prior to the surgical removal of the tumor,and CD40L was measured before and after the neoadjuvant treatment.They found that the post-treatment CD40L level of patients with a high response rate to the treatment was significantly lower,while no change was observed in those patients with low response rates[11].Results of the current study confirmed the observations of those former studies[7,10,27]where circulating CD40L level was tendentiously higher in CRC patients than those of control patients.We also observed the highest measurements in Stage IV cancer and found that the CD40L level of CRC patients is basically constant with the course of the disease.The initial differences in CD40L levels between those patients with or without distant metastasis or thrombocytosis were observable throughout the whole course of the disease.The latter observation showed,that the CD40L level was the highest in those patients with more advanced disease.This should be the cause behind higher pre- and postoperative CD40L levels associated with shorter survival of patients,with high probability.Similar to our findings,the highest soluble CD40L levels have been observed in patients with distant metastases in squamous cancer or adenocarcinoma of the lung[29],in nasopharyngeal carcinoma[30],and in gastric cancer[31].

        In the course of a great many journeys to the forest he carried away many rich stuffs and much fine linen36, and set up a shop opposite that of Ali Baba s son

        ACKNOWLEDGEMENTS

        We are grateful to Viktor Madar-Dank for English proofreading.

        All study participants,or their legal guardian,provided informed written consent before study enrollment.

        FOOTNOTES

        Herold Z,Herold M,and Somogyi A built the study design;Herold M,Herczeg G,Fodor A,and Herold Z were involved in the collection of samples;Herold Z analyzed the data;Herold Z,Herold M,Herczeg G,Szasz AM,and Dank M interpreted data;Herold Z prepared the draft of the manuscript;all authors were involved in editing and reviewing;Somogyi A and Herold Z received funding;Somogyi A supervised the study;all authors have read and agreed to the published version of the manuscript.

        the National Research,Development and Innovation Office,No.K-116128;and the New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research,Development and Innovation Fund,No.UNKP-20-4-I.

        The study was reviewed and approved by the Regional and Institutional Committee of Science and Research Ethics,Semmelweis University(SE TUKEB 21-12/1994,approval date of latest modification: February 10,2017),the Institutional Review Board of Szent Imre University Teaching Hospital(SZIK IKEB 5/2017),and the Committee of Science and Research Ethics,Hungarian Medical Research Council(ETT TUKEB 8951-3/2015/EKU).

        Christmas toys torn from their wrapping,ribbons tangled8 in the treesand there upon the forest floorlay Santa Claus, and all could seethat he was hurt from the tragic9 crashbut just how bad no one would ask

        There are no conflicts of interest to report.

        The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

        The authors have read the STROBE Statement—checklist of items,and the manuscript was prepared and revised according to the STROBE Statement—checklist of items.

        When the King saw the snake shut itself into a room with his daughter, he said to his wife, Heaven be merciful to our child, for I fear it is all over with her now

        This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers.It is distributed in accordance with the Creative Commons Attribution NonCommercial(CC BYNC 4.0)license,which permits others to distribute,remix,adapt,build upon this work non-commercially,and license their derivative works on different terms,provided the original work is properly cited and the use is noncommercial.See: http://creativecommons.org/Licenses/by-nc/4.0/

        Hungary

        I added to that my constant and fervent15 prayers that you would be objective and fair, with the ability to set limitations while offering my child a chance to learn self-control and to soar a bit in the process

        Zoltan Herold 0000-0001-5990-4889;Magdolna Herold 0000-0002-1036-6343;Gyorgy Herczeg 0000-0003-2222-0672;Agnes Fodor 0000-0003-3342-5112;Attila Marcell Szasz 0000-0003-2739-4196;Magdolna Dank 0000-0002-4694-3624;Aniko Somogyi 0000-0003-0807-260X.

        Chen YL

        It was about seven o clock in the morning when this extraordinary chariot reached the palace gates; the King was already astir, and about to set off on a hunting expedition; as for the Queen, she had only just gone off into her first sleep, and it would have been a bold person indeed who ventured to wake her

        Filipodia

        Chen YL

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