[1] Leiden Univ, Willem Alexander Childrens Hosp, Dept Pediat, Med Ctr, POB 9600, NL-2300 RC Leiden, Netherlands
[2] New Childrens Hosp, POB 347, Helsinki 00029, Finland
[3] Hosp Univ & Polytech Hosp LA FE, Paediat Transplant Unit, Avinguda de Fernando Abril Martorell 106, Valencia 46026, Spain
[4] Sheba Med Ctr, Edmond & Lily Safra Childrens Hosp, Div Pediat Hematol & Oncol, IL-52621 Ramat Gan, Israel
[5] EBMT Stat Unit, F-75571 Paris 12, France
[6] EBMT Leiden Study Unit, Rijnsburgerweg 10, NL-2333 AA Leiden, Netherlands
[7] EBMT Paris Study Unit, F-75571 Paris 12, France
[8] Osped Pediat Bambino Gesu, Dept Oncohematol & Cell & Gene Therapy, Piazza St Onofrio 4, I-00165 Rome, Italy
[9] European Inst Oncol IRCCS, IEO, Via Ripamonti 435, I-20141 Milan, Italy
[10] Kings Coll Hosp NHS Fdn Trust, Dept Haematol Med, Denmark Hill, London SE5 9RS, England
[11] Christie Hosp NHS Fdn Trust, Haematol & Transplant Unit, Wilmslow Rd, Manchester M20 4BX, Lancs, England
[12] Univ Regensburg, Dept Pediat Hematol Oncol & Stem Cell Transplanta, Franz Josef Strauss Allee 11, D-93052 Regensburg, Germany
[13] Goethe Univ, Univ Hosp Frankfurt, Dept Children & Adolescents, Div Stem Cell Transplantat Immunol & Intens Care, Theodor Stern Kai 7, D-60590 Frankfurt, Germany