[1] Univ Cagliari, Neonatal Intens Care Unit, Inst Puericulture, I-09124 Cagliari, Italy
[2] Univ Cagliari, Neonatal Sect, I-09124 Cagliari, Italy
[3] Univ Cagliari, Dept Toxicol, I-09124 Cagliari, Italy
[4] Univ Cagliari, Dept Neurol Sci, I-09124 Cagliari, Italy
[5] Univ Roma La Sapienza, Paediat Intens Care Unit, Rome, Italy