1 Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan.
2 Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.
3 Taichung Hospital, Ministry of Health and Welfare, Executive Yuan, Taichung, Taiwan; Department of Healthcare, Central Taiwan University of Science and Technology, Taichung, Taiwan. Electronic address: yehchouming@hotmail.com.
4 Department of Surgery, Taichung Veterans General Hospital, Taichung, Taiwan; School of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan. Electronic address: cmchou@vghtc.gov.tw.