1. Department of Integrated Diagnostic Pathology, Nippon Medical School, Tokyo 113‑8602, Japan
2. Department of Gastrointestinal and Hepato‑Biliary‑Pancreatic Surgery, Nippon Medical School, Tokyo 113‑8602, Japan
3. Department of Gastrointestinal and Hepato‑Biliary‑Pancreatic Surgery, Nippon Medical School Musashi Kosugi Hospital, Tokyo 211‑8533, Japan