1. Department of Gastroenterology, Kobe Red Cross Hospital, Japan
2. Department of Gastroenterology, Kobe University Graduate School of Medicine, Japan
3. Asahara Clinic, Japan
4. Division of Gastroenterology, Department of Medicine, University of British Columbia, Canada
5. Division of Diagnostic Pathology, Kobe University Graduate School of Medicine, Japan
6. Department of Pathology, Shiga University of Medical Science Hospital, Japan