1 Neonatology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario "Agostino Gemelli" IRCCS, Rome, Italy; Neonatal Intensive Care Unit, Maternal-Fetal Department, "S. Camillo-Forlanini" Hospital, Rome, Italy.
2 Neonatal Intensive Care Unit, Infermi Hospital, Rimini, AUSL Romagna, Rimini, Italy.
3 Department of Surgery, Fondazione Policlinico Gemelli, Rome, Italy.
4 Neonatology Unit, Department of Woman and Child Health and Public Health, Fondazione Policlinico Universitario "Agostino Gemelli" IRCCS, Rome, Italy.