D.O. Ott Research Institute of Obstetrics, Gynecology and Reproductology, Mendeleevskaya line, 3, 199034, St. Petersburg, Russia; St. Petersburg State University, Universitetskaya emb., 7/9, 199034, St. Petersburg, Russia; S.M. Kirov Military Medical Academy, Lebedeva st., 6, 194044, St. Petersburg, Russia.