1. Nadezhda Women’s Health Hospital, Sofia, Bulgaria
2. Obstetrics and Gynecology Unit, Department of General Surgery and Medical Surgical Specialties, University of Catania, Catania, Italy
3. Department of Neuroscience, Reproductive Sciences and Dentistry, School of Medicine, University of Naples "Federico II", Naples, Italy
4. Department of Obstetrics and Gynecology, Division of Reproductive Endocrinology and Infertility, Western University, London, Canada
5. Department of Medical Genetics, Medical Faculty, Medical University – Sofia, Sofia, Bulgaria
6. Hillel Yaffe Medical Center/Technion - Israel Technology Institute, Hadera, Israel