[1] Univ Duisburg Essen, Fac Med, Essen, Germany
[2] Univ Hosp Essen, West German Canc Ctr, Pediat 3, Essen, Germany
[3] German Canc Consortium, Partnersite Essen, Essen, Germany
[4] Univ Sydney, Chris OBrien Lifehouse, Fac Med & Hlth, Camperdown, NSW, Australia
[5] Catholic Univ Louvain, Clin Univ St Luc, Dept Pediat Haematol & Oncol, Brussels, Belgium
[6] Charles Univ Prague, Motol Childrens Hosp, Prague, Czech Republic
[7] Univ Hosp Muenster, West German Canc Ctr Network, Radiotherapy & Radiooncol, Munster, Germany
[8] Queen Silvia Childrens Hosp, Childhood Canc Ctr, Gothenburg, Sweden
[9] Leiden Univ, Med Ctr, Dept Med Oncol, Leiden, Netherlands
[10] Univ Hosp Essen, West German Canc Ctr, Clin Orthoped, Essen, Germany
[11] Prinses Maxima Centrum Kinderoncol, Pediat Oncol, Utrecht, Netherlands
[12] Univ Hosp Muenster, Gerhard Domagk Inst Pathol, West German Canc Ctr Network, Essen, Germany
[13] Borsod Abauj Zemplen Cty Univ Teaching Hosp, Velkey Laszlo Childs Hlth Ctr, Miskolc, Hungary
[14] Univ Childrens Hosp Munster, Dept Pediat Hematol & Oncol, West German Canc Ctr Network, Munster, Germany
[15] HUS Helsinki Univ Hosp, New Childrens Hosp, Div Hematol & Stem Cell Transplantat, Helsinki, Finland
[16] Univ Childrens Hosp Basel, Dept Oncol Haematol, Basel, Switzerland
[17] Mother & Child Inst, Dept Oncol & Surg Oncol Children & Youth, Warsaw, Poland
[18] Vilnius Univ, Clin Obstetr & Gynecol, Fac Med, Vilnius, Lithuania
[19] Univ Hosp Essen, Dept Particle Therapy, West German Proton Therapy Ctr Essen Wpe, West German Caner Ctr Wtz,German Canc Consortium, Essen, Germany
[20] St Josefs Hosp Bochum, Univ Hosp Bochum, Bochum, Germany