1. Division of Pediatric Surgery, Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan, Republic of China.
2. School of Medicine, National Yang Ming Chiao Tung University, Taipei City, Taiwan, Republic of China.
3. Department of Surgery, Taichung Hospital, Ministry of Health and Welfare, Executive Yuan, Taichung, Taiwan, Republic of China.
4. Department of Healthcare, Central Taiwan University of Science and Technology, Taichung, Taiwan, Republic of China.