[1] Westfal Wilhelms Univ Munster, Munster, Germany
[2] Gustave Roussy, Dept Biostatist & Epidemiol, Canc Campus, Grand Paris, Villejuif, France
[3] Royal Manchester Childrens Hosp, Manchester, Lancs, England
[4] Royal Marsden Hosp, Sutton, Surrey, England
[5] IWK Hlth Ctr, Halifax, NS, Canada
[6] Childrens Hosp, Bronx, NY USA
[7] Stanford Univ, Sch Med, Palo Alto, CA 94304 USA
[8] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[9] Gustave Roussy Canc Campus, Biostatist Unit, Villejuif, France
[10] Inst Gustave Roussy, Villejuif, France
[11] Univ Paris Sud, Gustave Roussy Canc Campus, Paris Saclay Univ, Dept Biostatist & Epidemiol, Villejuif, France
[12] Inst Hematol & Oncol Pediat, Lyon, France
[13] Westfalische Wilhelms Univ Munster, Inst Biostatist & Clin Res, Munster, Germany
[14] Kinderklin Datteln, Dattlen, Germany
[15] Univ Kinderklin, Munster, Germany
[16] Univ Lund Hosp, Lund, Sweden
[17] Univ Birmingham, Birmingham, W Midlands, England
[18] Childrens Oncol Grp, Arcadia, CA USA
[19] Univ Coll Hosp, London, England
[20] Seattle Childrens Hosp, Seattle, WA USA