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