S.V. VEREZGOVA, E.B. TROIK, V.K. RYZHKOV  North-Western State Medical University named after I.I. Mechnikov, 41 Kirochnaya St., Saint-Petersburg, Russian Federation 191214 Verezgova S.V. — postgraduate student of the Department of Obstetrics and Gynecology named after S.N. Davydov; tel. +7-911-944-45-81, e-mail: filipersik@mail.ru Troik E.B. — D. Med. Sc., Professor of the Department of Obstetrics and Gynecology […]