1 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital (Linkou) and Chang Gung University College of Medicine (Drs. Yen and Y-S Lin), Taoyuan. Electronic address: yen2158@cgmh.org.tw.
2 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital (Linkou) and Chang Gung University College of Medicine (Drs. Yen and Y-S Lin), Taoyuan.
3 Taipei Medical University School of Nursing (Dr. S-L Lin), Taipei, Taiwan.