1. Department of Pathology; Hokkaido Gastroenterology Hospital; Sapporo Japan
2. Department of Pathology; Hokkaido University Hospital; Sapporo Japan
3. Division of Diagnostic Pathology; Department of Clinical Laboratory Medicine; Shiga University of Medical Science; Otsu Japan
4. Department of Molecular Pathology; Hiroshima University Institute of Biomedical and Health Sciences; Hiroshima Japan