1 Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, School of Medicine, National Yang-Ming University, Institute of Clinical Medicine, National Yang-Ming University, Department of Obstetrics and Gynecology, Cheng Hsin General Hospital, Taipei, Taiwan. Electronic address: chenyj@vghtpe.gov.tw.
2 School of Medicine, National Yang-Ming University, Department of Emergency Medicine, Taipei Veterans General Hospital, Taipei, Taiwan.
3 Department of Obstetrics and Gynecology, Taipei Veterans General Hospital, School of Medicine, National Yang-Ming University, Institute of Clinical Medicine, National Yang-Ming University, Taipei, Taiwan.