1. D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductive Medicine, Department of Obstetrics, Division of Maternal-Fetal Medicine, St. Petersburg, Russia
2. Department of Obstetrics, Gynecology and Reproduction, Faculty of Medicine, St. Petersburg State University, St Petersburg, Russia
3. D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductive Medicine, Department of pathology, St. Petersburg, Russia
4. Saint Petersburg State Pediatric Medical University of Health Ministry of Russia, Saint Petersburg, Russia
5. I.I. Mechnikov north-Western state Medical University, Saint Petersburg, Russia