1 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, (Drs. You, Chueh, Huang, Wang, and Yen).
2 Department of Emergency Medicine, Chang Gung Memorial Hospital at Keelung (Dr. Chen).
3 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, (Drs. You, Chueh, Huang, Wang, and Yen); Graduate Institute of Clinical Medical Sciences, Chang Gung University College of Medicine, (Dr. Wang), Tao-Yuan, Taiwan.
4 Department of Obstetrics and Gynecology, Chang Gung Memorial Hospital at Linkou and Chang Gung University College of Medicine, (Drs. You, Chueh, Huang, Wang, and Yen). Electronic address: yen2158@cgmh.org.tw.