[1] Univ Lucerne, Dept Hlth Sci & Hlth Policy, Luzern, Switzerland
[2] Danish Canc Soc, Res Ctr, Childhood Canc Res Grp, Copenhagen, Denmark
[3] Univ Childrens Hosp Zurich, Dept Pediat Oncol, Zurich, Switzerland
[4] Geneva Univ Hosp, Dept Pediat, Oncohematol Unit, Geneva, Switzerland
[5] Swiss Childhood Canc Registry, Inst Social & Prevent Med, Bern, Switzerland
[6] Univ Bern, Bern Univ Hosp, Inselspital, Pediat Endocrinol Diabetol & Metab,Dept Pediat, Bern, Switzerland