[1] Chang Gung Mem Hosp, Dept OB GYN, Taoyuan, Taiwan
[2] St Johns Med Coll, Bangalore, Karnataka, India
[3] Kaohsiung Chang Gung Mem Hosp, Chang Gung Univ Coll Med, Dept Obstet & Gynecol, Chang Gung Mem Hosp, Kaohsiung, Taiwan
[4] Chang Gung Mem Hosp, Biostatist & Informat Unit, Clin Trial Ctr, Taoyuan, Taiwan
[5] Chang Gung Mem Hosp, Chiayi Branch, Chang Gung Univ Coll Med, Dept Obstet & Gynecol, Chiayi, Taiwan
[6] Chang Gung Mem Hosp, Chang Gung Univ Coll Med, Dept Obstet & Gynecol, Taoyuan, Taiwan
[7] Chang Gung Mem Hosp, Dept Obstet & Gynecol, Taoyuan, Taiwan
[8] Chang Gung Mem Hosp, Chang Gung Univ Coll Med, Taoyuan, Taiwan
[9] Chang Gung Mem Hosp, Chang Gung Univ Coll Med, Dept Obstet & Gynecol, Linkou Branch, Taoyuan, Taiwan
[10] Chang Gung Mem Hosp, Chang Gung Univ Coll Med, Linkou Branch, Dept Obstet & Gynecol, Taoyuan, Taiwan
[11] China Med Univ Hosp, Dept Obstet & Gynecol, Taichung, Taiwan
[12] Taipei Med Univ, Wan Fang Hosp, Dept Obstet & Gynecol, Taipei, Taiwan