1. Department of Gynecology and Endocrinology, FSBSI "The Research Institute of Obstetrics, Gynecology and Reproductology named after D.O.Ott", Saint Petersburg, Russia
2. Department of Obstetrics and Gynecology, North-Western State Medical University named after I.I. Mechnikov, Saint Petersburg, Russia
3. Department of Pathomorphology, FSBSI "The Research Institute of Obstetrics, Gynecology and Reproductology named after D.O.Ott", Saint Petersburg, Russia