1. Department of Medicine and Surgery, Obstetrics and Gynecology Unit University of Parma Parma Italy
2. Department of Obstetrics and Gynecology St Joseph Krankenhaus Berlin Germany
3. Department of Obstetrics and Gynecology, Fondazione Policlinico Tor Vergata University of Rome Tor Vergata Rome Italy
4. Department of Obstetrics and Gynecology, Sant'Anna Hospital University of Turin Turin Italy