Arch Gynecol Obstet 2019 03 31;299(3):725-732. Epub 2019 Jan 31.
Department of Obstetrics and Gynecology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82, Gumi-ro 173 Beon-gil, Seongnamsi, Kyeonggido, 463-707, Korea.