[1] Univ Bologna, Dept Pediat, Bologna, Italy
[2] V Buzzi Children Hosp, Reg Screening Ctr Lombardia Reg, Milan, Italy
[3] Univ Roma La Sapienza, Dept Expt Med & Pathol, Rome, Italy
[4] Univ Catania, Dept Endocrinol, I-95124 Catania, Italy
[5] G Gaslini Inst Children, Dept Pediat Sci Giovanni de Toni, Genoa, Italy
[6] Univ Pisa, Dept Pediat, Pisa, Italy
[7] G Gaslini Inst Children, Pediat Clin, Genoa, Italy
[8] Italian Natl Inst Hlth, Natl Ctr Epidemiol Surveillance & Hlth Promot, Rome, Italy
[9] Univ Milan, Fdn IRCCS Ca Granda Osped Maggiore Policlin, Dept Clin Sci & Community Hlth, NICU, Milan, Italy
[10] Meyer Children Hosp, Clin Pediat Neurol, Florence, Italy
[11] Univ Naples Federico II, Dept Pediat, Naples, FL USA
[12] S Croce Hosp, Dept Pediat Neuropsychiat, Fano, Italy
[13] Univ Pisa, Dept Endocrinol & Metab, Pisa, Italy
[14] Univ Vita Salute San Raffaele, Dept Pediat, San Raffaele Sci Inst, Milan, Italy
[15] Italian Natl Inst Hlth, Dept Cell Biol & Neurosci, Rome, Italy