[1] Univ Toronto, Hosp Sick Children, Toronto, ON, Canada
[2] Univ Paris Saclay, Unit Biostat & Epidemiol, Gustave Roussy, Villejuif, France
[3] Newcastle Upon Tyne Hosp NHS Fdn Trust, Dept Paediat Haematol & Oncol, Newcastle Upon Tyne, Tyne & Wear, England
[4] Semmelweis Univ, Dept Pediat Hematol & Oncol, Budapest, Hungary
[5] Wroclaw Med Univ, Dept Pediat Bone Marrow Transplantat Oncol & Hema, Wroclaw, Poland
[6] Univ Hong Kong, Queen Mary Hosp, Li Ka Shing Fac Med, Dept Pediat & Adolescent Med, Hong Kong, Peoples R China
[7] Univ Valencia, Dept Pediat Hematol & Oncol, Valencia, Spain
[8] Univ Hosp Leuven, Dept Pediat Hematol & Oncol, Leuven, Belgium
[9] Cambridge Univ Hosp NHS Fdn Trust, Addenbrookes Hosp, Dept Paediat Haematol Oncol & Palliat Care, Cambridge, England
[10] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[11] Univ Padua, Dept Pediat Hematol & Oncol, Padua, Italy
[12] George Washington Univ, Ctr Canc & Immunol Res, Washington, DC USA
[13] George Washington Univ, Washington, DC USA
[14] Univ Southern Calif, Keck Sch Med, Dept Prevent Med, Los Angeles, CA 90007 USA
[15] Royal Marsden NHS Fdn Trust, Dept Histopathol, London, England
[16] Univ Paris Saclay, Gustave Roussy, Dept Pediat, Villejuif, France
[17] Univ Paris Saclay, Gustave Roussy, Dept Adolescent Oncol, Villejuif, France
[18] Childrens Hosp Colorado, Ctr Canc & Blood Disorders, Aurora, CO USA