[1] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Pediat, I-20122 Milan, Italy
[2] Univ Brescia, Spedali Civili, Dept Pediat, Brescia, Italy
[3] Univ Brescia, Pediat Clin, Dept Clin & Expt Sci, Brescia, Italy
[4] Spedali Civil Brescia, I-25125 Brescia, Italy
[5] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Internal Med, I-20122 Milan, Italy
[6] Univ Bari, Policlin Giovanni Hosp 23, Dept Pediat Sci & Surg, Unit Hematol & Oncol, Bari, Italy
[7] Univ Turin, Dept Immunol Rheumatol & Infect Dis, Osped Infantile Regina Margherita, Turin, Italy
[8] Univ Catania, Azienda Policlin Vittorio Emanuele, Pediat Haematol & Oncol, Catania, Italy
[9] Univ Verona, Dept Med, I-37100 Verona, Italy
[10] Univ Naples Federico II, Dept Translat Med Sci, Unit Pediat Immunol, Naples, Italy
[11] Univ Naples Federico II, Dept Translat Med Sci, Immunol Unit, Naples, Italy
[12] Univ Messina, Dept Pediat, Azienda G Martino, Messina, Italy
[13] Univ Roma La Sapienza, Dept Pediat, I-00185 Rome, Italy
[14] Univ Bologna, Policlin S Orsola Malpighi, Dept Pediat, Bologna, Italy
[15] Univ Roma Tor Vergata, Policlin Tor Vergata, Pediat Allergol & Immunol Unit, Rome, Italy
[16] Pediat Univ Pavia, Policlin San Matteo, Pavia, Italy
[17] Liver Res Ctr, Clin Epidemiol Unit, Trieste, Italy
[18] Univ Milan, Int Ctr Assessment Nutr Status, Milan, Italy