1. Department of Obstetrics and Gynecology; University of Insubria; Varese Italy
2. Department of Obstetrics and Gynecology; Buzzi Hospital -ASST FBF Sacco; University of Milan; Milan Italy
3. Department of Obstetrics and Gynecology; EOC - Beata Vergine Hospital; Mendrisio Switzerland
4. Obstetrics and Gynecology Unit; Vita-Salute San Raffaele University and IRCCS San Raffaele Hospital; Milan Italy