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