[1] Chang Gung Univ, Chang Gung Mem Hosp, Dept Obstet & Gynecol, Linkou Med Ctr, Tao Yuan, Taiwan
[2] Kaohsiung Municipal Hsiaokang Hosp, Dept Obstet & Gynecol, Kaohsiung, Taiwan
[3] Chung Ho Mem Hosp, Kaohsiung, Taiwan
[4] Kaohsiung Med Univ, Fac Med, Kaohsiung, Taiwan