[1] Univ Bern, Inst Social & Prevent Med, Mittelstr 43, CH-3012 Bern, Switzerland
[2] Univ Geneva, Dept Pediat Gynecol & Obstet, CANSEARCH Res Platform Pediat Oncol & Hematol, Geneva, Switzerland
[3] Univ Bern, Grad Sch Hlth Sci, Bern, Switzerland
[4] Univ Hosp Bonn, Dept Pediat Hematol & Oncol, Bonn, Germany
[5] Johannes Gutenberg Univ Mainz, Div Childhood Canc Epidemiol, German Childhood Canc Registry, Inst Med Biostat Epidemiol & Informat IMBEI,Univ M, Mainz, Germany
[6] Boyne Res Inst, Drogheda, Ireland
[7] Univ Hosp Children & Adolescents, Dept Pediat Oncol & Hematol, Lubeck, Germany
[8] Westphalian Wilhems Univ, Univ Hosp Munster, Dept Phoniatr & Pedaudiol, Munster, Germany
[9] Univ Bern, Dept Pediat, Inselspital, Bern Univ Hosp, Bern, Switzerland
[10] Bavarian Care & Nursing Author, Amberg, Germany
[11] Masaryk Univ, Univ Hosp Brno, Brno, Czech Republic
[12] Masaryk Univ, Int Clin Res Ctr FNUSA ICRC, Brno, Czech Republic
[13] Charles Univ Prague, Dept Pediat Hematol & Oncol, Fac Med 2, Prague, Czech Republic
[14] Univ Hosp Motol, Prague, Czech Republic
[15] Univ Hosp, Dept Pediat Hematol Oncol, St Etienne, France
[16] Jean Monnet Univ, Lyon Univ, INSERM U 1059, Sainbiose, St Etienne, France
[17] Univ Bern, Bern Univ Childrens Hosp, Dept Pediat Endocrinol Diabetol & Metab, Inselspital, Bern, Switzerland
[18] Univ Bern, Dept BioMed Res, Bern, Switzerland
[19] Univ Bern, Bern Univ Hosp, Dept Pediat, Div Pediat Hematol Oncol,Inselspital, Bern, Switzerland