1. Department of Human Reproduction, Division of Gynaecology and Obstetrics, University Medical Centre Ljubljana, Ljubljana, Slovenia
2. Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
3. Department of Obstetrics and Gynaecology, Azienda di Rilievo Nazionale e di Alta Specializzazione (ARNAS) Garibaldi Nesima, Catania, Italy
4. Department of Obstetrics and Gynecology, AOUI Verona, University of Verona, Verona, Italy
5. Department of Obstetrics and Gynecology, “Filippo Del Ponte” Hospital, University of Insubria, Varese, Italy
6. Department of Obstetrics and Gynecology, Kiel School of Gynecological Endoscopy, University Hospital Schleswig Holstein, Kiel, Germany
7. Department of Obstetrics and Gynecology, University Hospital Schleswig Holstein, Luebeck, Germany