1. School of Medicine, Chung Shan Medical University, Taichung City, Taiwan.
2. Teaching and Research Department, Mackay Memorial Hospital, Taipei City, Taiwan.
3. Taipei City Hospital, Taipei City, Taiwan.
4. Department of Health Care Management, National Taipei University of Nursing and Health Sciences, Taipei City, Taiwan.
5. School of Medicine, National Yang-Ming University, Taipei City, Taiwan.
6. Department of Surgery, College of Medicine, National Taiwan University, Taipei City, Taiwan.