1. Department of Obstetrics and Gynecology; ARNAS Civico, Di Cristina e Benfratelli; Palermo; Italy
2. Operative Unit of Pediatrics and Neonatal Intensive Therapy, Mother and Child Department; University of Palermo; Palermo; Italy
3. Department of Obstetrics and Gynecology; University Hospital ‘Paolo Giaccone’; Palermo; Italy