1. Department of Obstetrics and Gynecology, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan;
2. Department of Obstetrics and Gynecology, School of Medicine, Tzu Chi University, Hualien, Taiwan;
3. School of Medicine, Tzu Chi University, Hualien City, Taiwan;
4. Department of Research, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taipei, Taiwan;
5. Department of Emergency Medicine, Taipei Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, New Taipei, Taiwan;
6. Department of Emergency Medicine, School of Medicine, Tzu Chi University, Hualien, Taiwan