1. Research Department, Nadezhda Women’s Health Hospital, Sofia, Bulgaria
2. Department of Obstetrics and Gynaecology, Nadezhda Women’s Health Hospital, Sofia, Bulgaria
3. Department of Medical Genetics, Medical Faculty, Medical University of Sofia, Sofia, Bulgaria
4. Department of Genetics, Nadezhda Women’s Health Hospital, Sofia, Bulgaria
5. Department of Pathology, Nadezhda Women’s Health Hospital, Sofia, Bulgaria