1. Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa 078‑8510, Japan
2. Department of Gastroenterology and Advanced Medical Sciences, Asahikawa Medical University, Asahikawa 078‑8510, Japan
3. Division of Tumor Pathology, Department of Pathology, Asahikawa Medical University, Asahikawa 078‑8510, Japan
4. Asahikawa Medical University Hospital Emergency Unit, Asahikawa 078‑8510, Japan
5. Center for Advanced Research and Education, Department of Medicine, Asahikawa Medical University, Asahikawa 078‑8510, Japan