1. Department of Obstetrics and Gynaecology; Institute for Maternal and Child Health - IRCCS Burlo Garofolo; Trieste Italy
2. Department of Obstetrics and Gynaecology; The Helen Schneider Hospital for Women at Rabin Medical Center; Petah-Tiqva Israel
3. Department of Obstetrics and Gynaecology; Hospital Angelo Zelarino di Mestre; Mestre-Venezia Italy
4. Clinical Epidemiology and Public Health Research Unit; Institute for Maternal and Child Health - IRCCS Burlo Garofolo; Trieste Italy