1. Department of Gynecology, Breast Center, Charité University Hospital, Berlin, Germany
2. First Department of Obstetrics and Gynecology, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. Department of Obstetrics and Gynecology, Filippo Del Ponte Hospital, University of Insubria, Varese, Italy
4. Department of Obstetrics and Gynecology, University Hospital of Schleswig Holstein, Kiel, Germany