1. Department of Surgery; Yokohama City University; Yokohama Japan
2. Department of Biostatistics; The University of Tokyo; Tokyo Japan
3. Department of Minimally Invasive Surgical and Medical Oncology; Fukushima Medical University; Fukushima Japan
4. Department of Surgery; Tokai University; Isehara Japan
5. Faculty of Engineering; Tokyo University of Science; Tokyo Japan
6. Cancer Treatment Center; Kochi Medical School Hospital; Kochi Japan
7. Department of Surgery; Keio University School of Medicine; Tokyo Japan
8. Department of Gastroenterological Surgery; Nagoya University Graduate School of Medicine; Nagoya Japan
9. Tokai Central Hospital; Kakamigahara Japan
10. Japanese Foundation for Multidisciplinary Treatment of Cancer; Tokyo Japan
11. Department of Gastrointestinal Surgery; Kanagawa Cancer Center; Yokohama Kanagawa Japan