[1] Seoul Natl Univ, Coll Med, Dept Obstet & Gynecol, Seoul, South Korea
[2] Sungkyunkwan Univ, Dept Obstet & Gynecol, Sch Med, Samsung Med Ctr, Seoul, South Korea
[3] Natl Canc Ctr, Ctr Gynecol Canc, Goyang Si, South Korea
[4] Ctr Clin Trial, Goyang Si, South Korea
[5] Yonsei Univ, Coll Med, Inst Womens Life Med Sci, Dept Obstet & Gynecol, Seoul, South Korea
[6] Asan Med Ctr, Dept Obstet & Gynecol, Seoul, South Korea
[7] Seoul Natl Univ, Dept Obstet & Gynecol, Bundang Hosp, Seongnam Si, South Korea