[1] Univ Pavia, Dept Internal Med & Therapeut, I-27100 Pavia, Italy
[2] IRCCS, Policlin S Matteo, Res Labs Pediat Oncohematol & Immunol, Pavia, Italy
[3] Univ Genoa, Dept Pediat, G Gaslini Inst, Genoa, Italy
[4] IRCCS, Policlin S Matteo, Biometr Unit, Pavia, Italy
[5] IRCCS, Policlin S Matteo, Dept Pediat, Pavia, Italy