[1] Univ Turin, Neonatal Intens Care Unit, Dept Pediat, I-10133 Turin, Italy
[2] Meyer Pediat Hosp, Neonatal Intens Care, I-50100 Florence, Italy
[3] Univ Eastern Piedmont & Novara, Dept Med Sci, Unit Med Sci, I-28100 Novara, Italy
[4] Macedonio Melloni Hosp, Div Neonatol, Ctr Infant Nutr, I-20129 Milan, Italy