[1] Asan Med Ctr, Obstetr & Gynecol, Seoul, South Korea
[2] Korea Univ, Guro Hosp, Coll Med, Obstet & Gynecol, Seoul, South Korea
[3] Seoul Natl Univ Hosp, Seoul, South Korea
[4] Seoul Natl Univ, Interdisciplinary Program Med Informat, Coll Med, Seoul, South Korea
[5] Seoul Natl Univ, Anesthesiol & Pain Med, Coll Med, Seoul, South Korea
[6] Keimyung Univ, Sch Med, Med Informat, Daegu, South Korea
[7] Seoul Natl Univ, Seoul Metropolitan Govt Boramae Med Ctr, Anesthesiol & Pain Med, Seoul, South Korea
[8] Seoul Natl Univ Hosp, Transdisciplinary Dept Med & Adv Technol, Seoul, South Korea
[9] Seoul Natl Univ Hosp, Biomed Res Inst, Seoul, South Korea
[10] Seoul Natl Univ, Seoul Metropolitan Govt Boramae Med Ctr, Obstetr & Gynecol, Seoul, South Korea
[11] Keimyung Univ, Obstetr & Gynecol, Dongsan Med Ctr, Daegu, South Korea
[12] Keimyung Univ, Obstetr & Gynecol, Sch Med, Daegu, South Korea
[13] Univ Ulsan, Coll Med, Obstetr & Gynecol, Seoul, South Korea
[14] Chonnam Natl Univ, Sch Med, Obstetr & Gynecol, Gwangju, South Korea
[15] Seoul Natl Univ, Obstetr & Gynecol, Coll Med, Seoul, South Korea