[1] Univ Milano Bicocca, Osped San Gerardo, Pediat Clin, Monza, Italy
[2] Osped Riuniti Bergamo, USC Ematol, I-24100 Bergamo, Italy
[3] Osped San Gerardo, Ctr Trasfus UOS Aferesi, Monza, Italy
[4] IRCCS Giannina Gaslini, Dipartimento Ematol Oncol Pediat, Genoa, Italy
[5] Univ Cattolica S Cuore, Ist Ematol, Pediat Clin, Rome, Italy
[6] Univ Cagliari, Pediat Clin, Cagliari, Italy
[7] Univ Milan, Osped San Raffaele, Ist Sci, Unita Immunoematol Pediat & Trapianto Midollo Oss, I-20127 Milan, Italy