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