[1] Univ Hosp Essen, West German Canc Ctr, Dept Pediat Hematol Oncol, Clin Pediat 3, Essen, Germany
[2] Univ Hosp Leipzig, Dept Pediat Oncol Hematol & Hemostaseol, Leipzig, Germany
[3] Univ Hosp Heidelberg, Div Med Oncol, Working Grp Exercise Oncol, Heidelberg, Germany
[4] Natl Ctr Tumor Dis NCT, Heidelberg, Germany
[5] Hannover Med Sch MHH, Inst Sports Med, Hannover, Germany
[6] Tech Univ Munich, Inst Prevent Pediat, Dept Sport & Hlth Sci, Munich, Germany
[7] Tech Univ Munich, Dept Pediat, Kinderklin Munchen Schwabing, Munich, Germany
[8] Tech Univ Munich, Childrens Canc Res Ctr, TUM Sch Med, Munich, Germany