[1] Tech Univ Munich, TUM Sch Med & Hlth, Kinderklin Munchen Schwabing, Dept Pediat, Munich, Germany
[2] Tech Univ Munich, TUM Sch Med & Hlth, Kinderklin Munchen Schwabing, Childrens Canc Res Ctr, Munich, Germany
[3] Tech Univ Munich, TUM Sch Med & Hlth, Inst Prevent Paediat, Dept Hlth & Sport Sci, Munich, Germany
[4] KioNet, Childrens Oncol Network Bavaria, Erlangen, Germany
[5] Univ Hosp Essen, Clin Pediat Hematol & Oncol 3, Essen, Germany
[6] Univ Hosp Essen, West German Canc Ctr Essen, Essen, Germany