[1] Univ Bern, Inst Social & Prevent Med, Fac Med, Bern, Switzerland
[2] Univ Geneva, Dept Pediat Gynecol & Obstet, CANSEARCH Res Platform Pediat Oncol & Hematol, Geneva, Switzerland
[3] Univ Bern, Grad Sch Hlth Sci, Fac Med, Bern, Switzerland
[4] Univ Hosp Bonn, Dept Pediat Hematol & Oncol, Bonn, Germany
[5] Johannes Gutenberg Univ Mainz, Inst Med Biostat Epidemiol & Infomat IMBEI, Childhood Canc Epidemiol, Univ Med Ctr, Mainz, Germany
[6] Boyne Res Inst, Canc Res, Drogheda, Ireland
[7] Univ Hosp Children Adolescents Lubeck, Dept Pediat Oncol & Hematol, Lubeck, Germany
[8] Univ Hosp Munster, Dept Phoniatr & Pedaudiol, Munster, Germany
[9] Univ Bern, Univ Hosp Bern, Dept Pediat, Inselspital, Bern, Switzerland
[10] Bavarian Care & Nursing Author, Amberg, Germany
[11] Masaryk Univ, Univ Hosp Brno, Dept Pediat Oncol, Brno, Czech Republic
[12] Masaryk Univ, Dept Pediat Oncol, Int Clin Res Ctr FNUSA ICRC, Brno, Czech Republic
[13] Charles Univ Prague, Fac Med 2, Prague, Czech Republic
[14] Univ Hosp Motol, Dept Pediat Hematol & Oncol, Prague, Czech Republic
[15] St Etienne Univ Hosp, Dept Pediat Hematol & Oncol, St Etienne, France
[16] Univ Bern, Bern Univ Childrens Hosp, Dept Pediat Endocrinol Diabet & Metab, Inselspital, Bern, Switzerland
[17] Univ Bern, Dept Biomed Res, Bern, Switzerland
[18] Univ Bern, Bern Univ Childrens Hosp, Inselspital, Dept Pediat,Div Pediat Hematol Oncol, Bern, Switzerland