1 Department of Obstetrics and Gynecology, National Taiwan University Hospital, Yunlin Branch, Yunlin county, Taiwan.
2 Department of Obstetrics and Gynecology, National Taiwan University Hospital, National Taiwan University College of Medicine, Taipei, Taiwan.
3 School of Medicine, Tzu Chi University, Hualien, Taiwan; Emergency Department, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi, Taiwan.