1. Division of Gastrointestinal Surgery, Department of Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
2. Colorectal Surgery Department, Cancer Institute Hospital of Japanese Foundation for Cancer Research, Tokyo, Japan
3. Division of Minimally Invasive Surgery, Department of Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
4. Division of Community Medicine and Medical Network, Department of Social Community Medicine and Health Science, Kobe University Graduate School of Medicine, Kobe, Japan