[1] Taipei Med Univ Hosp, Dept Obstet & Gynecol, Taipei, Taiwan
[2] Chang Gung Mem Hosp, Dept Obstet & Gynecol, Keelung, Taiwan
[3] Natl Chung Hsing Univ, Dept Management Informat Syst, Taichung 40227, Taiwan
[4] Chang Gung Univ, Chang Gung Mem Hosp Linkou, Coll Med, Dept Obstet & Gynecol, Taoyuan, Taiwan