[1] Kantonsspital Aarau AG, Dept Pediat, Div Oncol Hematol, Tellstr 25, CH-5001 Aarau, Switzerland
[2] Univ Bern, Inst Social & Prevent Med, Bern, Switzerland
[3] Swiss Child Canc Assoc, Olten, Switzerland
[4] Childhood Canc Switzerland, Basel, Switzerland
[5] Univ Childrens Hosp Basel UKBB, Div Oncol Hematol, Basel, Switzerland
[6] Univ Basel, Basel, Switzerland
[7] McMaster Childrens Hosp, Dept Pediat, Hamilton, ON, Canada
[8] McMaster Univ, Hamilton, ON, Canada