Contribution to Authorship
All of the authors mentioned have actively participated in this paper. DELEHAYE F, ROD J, SARNACKI S and ORBACH D created the concept of this study, coordinated the data collection and analyses, and drafted mainly this paper. Authors working in pathologist departments let us to extract all the patients to review (DIJOUD F, WACRENIER A, CROUE A, POMMEPUY I, GALMICHE L). Surgeons and oncologist pediatricians participated in the data collection (DELEHAYE F, CHEIKHELARD A, ROUGER J, FAURE-CONTER C, HAMEURY F, AUBRY E, HABONIMANA E, DUCHESNE C, JOSEPH S, ALLIOT H, SCALABRE A, CHAUSSY Y, PODEVIN G, HARAUX E, BALLOUHEY Q, LAVRAND F, PEYCELON M, IRTAN S, GUERIN F, DARIEL A, BORIONNE C). Statistical analysis was carried out by PARIENTI JJ. All the co-authors revised the article to improve it. All of the authors approved the final version of the paper that we submit to publication to BJOG.