[1] Univ Toronto, Pediat Hematol & Oncol, Hosp Sick Children, Toronto, ON, Canada
[2] St Jude Childrens Res Hosp, Memphis, TN USA
[3] Beijing Childrens Hosp, Hematol & Oncol Ctr, Beijing, Peoples R China
[4] Stanford Univ, Sch Med, Palo Alto, CA 94304 USA
[5] Emma Childrens Hosp, Acad Med Ctr, Amsterdam, Netherlands
[6] Hosp St Joan de Deu, Barcelona, Spain
[7] Univ Med Ctr Hamburg Eppendorf, Dept Pediat Hematol & Oncol, Hamburg, Germany
[8] Meyer Childrens Hosp, Florence, Italy
[9] Beijing Friendship Hosp, Beijing, Peoples R China
[10] Childrens Hosp Colorado, Denver, CO USA
[11] Phoenix Childrens Hosp, Phoenix, AZ USA
[12] Blank Childrens Hosp, Des Moines, IA USA
[13] Hosp Univ Cruces, BioCruces Hlth Res Inst, Bizkaia, Spain
[14] Mem Sloan Kettering Canc Ctr, New York, NY USA
[15] St Jude Childrens Res Hosp, Dept Biostatist, Memphis, TN USA
[16] Hosp Sick Children, Toronto, ON, Canada
[17] St Jude Childrens Res Hosp, Oncol, Memphis, TN USA
[18] Childrens Hosp Philadelphia, Div Hematol Oncol, Philadelphia, PA USA