1. Department of Surgery, School of Medicine Tri‐Service General Hospital, National Defense Medical Center Taipei China
2. Division of Colon and Rectal Surgery, Department of Surgery, School of Medicine, Songshan Branch Tri‐Service General Hospital, National Defense Medical Center Taipei China
3. Division of Colon and Rectal Surgery, Department of Surgery, School of Medicine Tri‐Service General Hospital, National Defense Medical Center Taipei China