1 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, Tao-Yuan (Drs. Pai and Yen); Department of Nursing, Taipei Medical University School of Nursing, Taipei (Dr. Lin), Taiwan.
2 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, Tao-Yuan (Drs. Pai and Yen); Department of Nursing, Taipei Medical University School of Nursing, Taipei (Dr. Lin), Taiwan. Electronic address: yen2158@cgmh.org.tw.