1. Department of Obstetrics and Gynecology, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Foundation, and Tzu Chi University, Hualien, Taiwan
2. Management Office for Health Data, China Medical University Hospital, Taichung, Taiwan
3. College of Medicine, China Medical University, Taichung, Taiwan
4. Graduate Institute of Biomedical Sciences, China Medical University, Taichung, Taiwan
5. Department of Medical Research, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Foundation, and Tzu Chi University, Hualien, Taiwan
6. Institute of Medical Sciences, College of Medicine, Tzu Chi University, Hualien, Taiwan.