1. Department of Surgery, Toho University Ohashi Medical Center, Tokyo 153‑8515, Japan
2. Department of Human Science, University of Toyama, Toyama 930‑0194, Japan
3. Department of Surgery, Kamiichi General Hospital, Toyama 930‑0391, Japan
4. Department of Surgery, Toyama Nishi General Hospital, Toyama 939‑2716, Japan
5. Department of Surgery, Tomei Atsugi Hospital, Kanagawa 243‑8571, Japan
6. Department of Science and Surgery, University of Toyama, Toyama 930‑0194, Japan