1. Department of Women’s and Children’s Health, University Hospital of Padua, Via Giustiniani, 3, 35128 Padua, Italy
2. Independent Statistician, 36020 Solagna, Italy
3. Department of Medicine–DIMED, University of Padua, 35121 Padua, Italy
4. Department of Woman and Child, Ospedale Buon Consiglio Fatebenefratelli, 80122 Naples, Italy
5. Division of Neonatology, Careggi University Hospital of Florence, 50141 Florence, Italy
6. Health Women Department, Poliambulanza Foundation, 25124 Brescia, Italy
7. Department of Pediatrics-Neonatology, University of Michigan, Ann Arbor, MI 48109, USA