1. The Japanese Society of Gastroenterological Surgery Minato‐ku Japan
2. Department of Surgery Hamamatsu University School of Medicine Hamamatsu Japan
3. Department of Perioperative Functioning Care and Support Hamamatsu University School of Medicine Hamamatsu Japan
4. Department of Healthcare Quality Assessment Graduate School of Medicine University of Tokyo Bunkyo‐ku Japan
5. Hamamatsu University School of Medicine Hamamatsu Japan
6. Database Committee The Japanese Society of Gastroenterological Surgery Minato‐ku Japan