[1] Univ Lucerne, Dept Hlth Sci & Med, Luzern, Switzerland
[2] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[3] Univ Oslo, Fac Med, Inst Basic Med Sci, Dept Behav Sci Med, Oslo, Norway
[4] Radboud Univ Nijmegen, Dept Hematol, Med Ctr, Nijmegen, Netherlands
[5] St Jude Childrens Res Hosp, Dept Epidemiol & Canc Control, 332 N Lauderdale St, Memphis, TN 38105 USA
[6] St Jude Childrens Res Hosp, Dept Oncol, 332 N Lauderdale St, Memphis, TN 38105 USA
[7] Univ Rochester, Med Ctr, Dept Radiat Oncol, Rochester, NY 14627 USA
[8] Univ Rochester, Med Ctr, Dept Pediat, Rochester, NY 14627 USA
[9] Great North Childrens Hosp, Dept Paediat & Adolescent Haematol Oncol, Newcastle Upon Tyne, Tyne & Wear, England
[10] Newcastle Univ, Ctr Canc, Newcastle Upon Tyne, Tyne & Wear, England
[11] Newcastle Univ Ctr Canc, Newcastle Upon Tyne, Tyne & Wear, England
[12] Kantonsspital Aarau, Div Hematol Oncol, Dept Pediat, Aarau, Switzerland
[13] Univ Childrens Hosp Basel, Div Hematol Oncol, Basel, Switzerland
[14] Univ Basel, Basel, Switzerland
[15] McMaster Childrens Hosp, Dept Pediat, Hamilton, ON, Canada
[16] McMaster Univ, Hamilton, ON, Canada
[17] Childrens Healthcare Atlanta, Aflac Canc & Blood Disorders Ctr, Atlanta, GA USA
[18] Emory Univ, Sch Med, Dept Pediat, Atlanta, GA USA