[1] AOU Meyer, Dept Pediat Hematol Oncol, Florence, Italy
[2] Ist Nazl Ric Canc, I-16132 Genoa, Italy
[3] Addenbrookes Hosp, Inst Med Res, Cambridge, England
[4] AO V Cervello, Palermo, Italy
[5] Osped Pausillipon, Naples, Italy
[6] Ist Giannina Gaslini, I-16148 Genoa, Italy