1. Department of Regional Medicine and Education, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
2. Center for Medical Education, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
3. Division of Gastroenterology and Hematology/Oncology, Department of Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan
4. Department of General Medicine, Asahikawa Medical University, Asahikawa, Hokkaido, Japan