1. Department of Surgery, Tamana Regional Health Medical Center, Tamana, Kumamoto 865-0005, Japan
2. Department of Gastroenterological Surgery, Graduate School of Medical Sciences, Kumamoto University, Kumamoto 860‑8556, Japan
3. Lymphotec, Inc., Tokyo 135‑0041, Japan
4. Hakuzandori Clinic, Tokyo 100‑0011, Japan