1. Department of Obstetrics, Division of Maternal-Fetal Medicine, D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductive Medicine, St. Petersburg, Russia
2. Department of Obstetrics, Gynecology and Reproduction, Faculty of Medicine, St. Petersburg State University, St. Petersburg, Russia
3. Department of Genetics, D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductive Medicine, St. Petersburg, Russia