[1] Univ Milan, IRCCS, Osped Policlin, I-20122 Milan, Italy
[2] Ctr Natl Greffes Moelle Osseuse, Tunis, Tunisia
[3] Univ Naples, Dept Pediat, I-80138 Naples, Italy
[4] Istanbul Univ, Istanbul Fac Med, Istanbul, Turkey
[5] Univ Athens, Agia Sofia Childrens Hosp, Athens, Greece
[6] Weill Med Coll, Div Pediat Hematol, New York, NY USA
[7] Univ Krankenhaus Eppendorf, Poliklinikum, Hamburg, Germany
[8] Novartis, Basel, Switzerland