1. Department of Gynecology, Hospital “Saint Anna”, Medical University—“Prof. Dr. Paraskev Stoyanov”, 9002 Varna, Bulgaria
2. Research Institute, Medical University Pleven, 5800 Pleven, Bulgaria
3. Department of Gynecologic Oncology, Moscow City Oncology Hospital No. 62, Istra, 27, Str. 1-30, Moscow Region 143515, Russia
4. Department of Gynecologic oncology, Londrina Cancer Hospital, Londrina 86015-520, Brazil
5. Department of Gynecologic Oncology, Ankara Bilkent City Hospital, Maternity Hospital, 06800 Ankara, Turkey