[1] Princess Maxima Ctr Pediat Oncol, Utrecht, Netherlands
[2] Erasmus MC, Dept Pediat Oncol Hematol, Sophia Childrens Hosp, Rotterdam, Netherlands
[3] Netherlands Canc Inst, Dept Biometr, Amsterdam, Netherlands
[4] Our Ladys Childrens Hosp Crumlin, Dublin, Ireland
[5] Hosp Univ Vall dHebron Vall dHebron, Pediat Oncol & Hematol Dept, Barcelona, Spain
[6] Sheba Med Ctr, Div Pediat Hematol & Oncol, Ramat Gan, Israel
[7] Univ Childrens Hosp Muenster, Pediat Hematol & Oncol, Munster, Germany
[8] Erasmus MC, Dept Immunol, Rotterdam, Netherlands
[9] Pfizer Inc, Clin Pharmacol, San Diego, CA USA
[10] Pfizer Inc, Groton, CT 06340 USA
[11] Univ Paris, Robert Debre Hosp, AP HP, Dept Pediat Hematol & Immunol, Paris, France
[12] Rigshosp, Copenhagen, Denmark
[13] Univ Hosp Motol, Dept Pediat Hematol & Oncol, Prague, Czech Republic
[14] Karolinska Univ Hosp, Pediat Oncol Unit, Stockholm, Sweden
[15] Charite Univ Med Berlin, Div Hematol & Oncol, Dept Pediat, Berlin, Germany
[16] IRCCS Bambino Gesu Childrens Hosp, Dept Pediat Hematol Oncol Cell & Gene Therapy, Rome, Italy
[17] Univ Rome Sapienza, Dept Hematol Oncol & transfus Med, Osped Pediat Bambino Gesu, Rome, Italy