1. Department of Surgery, Sanjo General Hospital, Sanjo, Niigata 955‑0055, Japan
2. Department of Surgery, Nagaoka Red Cross Hospital, Nagaoka, Niigata 940‑2085; 3Department of Internal Medicine, Sanjo General Hospital, Sanjo, Niigata 955‑0055, Japan
3. Department of Internal Medicine, Sanjo General Hospital, Sanjo, Niigata 955‑0055, Japan
4. Department of Surgical Pathology, Hyogo Medical University School of Medicine, Nishinomiya, Hyogo 663‑8510, Japan
5. Division of Molecular and Diagnostic Pathology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Niigata 951‑8510, Japan