1. Doctoral Program in Biomedical Science; Graduate School of Comprehensive Human Sciences; University of Tsukuba; Ibaraki Japan
2. Department of Pathology; Faculty of Medicine; University of Tsukuba; Ibaraki Japan
3. Department of Pathology; Hitachi General Hospital; Ibaraki Japan
4. Department of Gastroenterology; Faculty of Medicine; University of Tsukuba; Ibaraki Japan