[1] Careggi Univ Hosp Florence, Dept Neurosci Psychol Drug Res & Child Hlth, I-50141 Florence, Italy
[2] Careggi Univ Hosp Florence, Div Neonatol, I-50141 Florence, Italy
[3] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Div Neonatol, Naples, Italy
[4] Univ Cattolica Sacro Cuore, Dept Pediat, Div Neonatol, I-00168 Rome, Italy