1. Research Institute, Medical University Pleven, 5800 Pleven, Bulgaria
2. Department of Gynecology, Hospital “Saint Anna”, Medical University—“Prof. Dr. Paraskev Stoyanov”, 9002 Varna, Bulgaria
3. Department of Gynecologic Oncology, Ankara Bilkent City Hospital, Maternity Hospital, 06800 Ankara, Turkey
4. Department of Obstetrics and Gynecology, Helios Hospital Müllheim, 79379 Müllheim, Germany
5. Faculty Associate, Medical Center, University of Freiburg, 79106 Freiburg, Germany
6. Diagnostic Imaging Department, Medical University of Sofia, 1431 Sofia, Bulgaria
7. National Cardiology Hospital, 1309 Sofia, Bulgaria
8. Department of Gynecologic Oncology, Medical University Pleven, 5800 Pleven, Bulgaria