[1] Seoul Natl Univ, Coll Med, Dept Obstet & Gynecol, Seoul 110744, South Korea
[2] Seoul Natl Univ Hosp, Healthcare Syst Gangnam Ctr, Seoul 110744, South Korea
[3] Seoul Natl Univ, Dept Obstet & Gynecol, Seoul Metropolitan Govt, Boramae Med Ctr, Seoul 110744, South Korea
[4] Seoul Natl Univ, Coll Med, Med Res Ctr, Inst Reprod Med & Populat, Seoul 110744, South Korea
[5] Maria Fertil Hosp, Dept Obstet & Gynecol, Seoul, South Korea
[6] Cheil Gen Hosp & Womens Healthcare Ctr, Dept Obstet & Gynecol, Seoul, South Korea
[7] Sungkyunkwan Univ, Sch Med, Dept Obstet & Gynecol, Seoul Samsung Hosp, Seoul, South Korea
[8] Miraewa Heemang Hosp, Dept Obstet & Gynecol, Seoul, South Korea
[9] Univ Ulsan, Coll Med, Asan Med Ctr, Dept Obstet & Gynecol, Seoul, South Korea
[10] Yonsei Univ, Coll Med, Gangnam Severance Hosp, Dept Obstet & Gynecol, Seoul, South Korea
[11] Mizmedi Womens Hosp, Dept Obstet & Gynecol, Seoul, South Korea
[12] Korea Univ, Coll Med, Dept Obstet & Gynecol, Seoul 136705, South Korea
[13] Korea Natl Inst Hlth, Div Cardiovasc & Rare Dis, Chungbuk, South Korea