1. Division of Gastroenterology; Department of Internal Medicine; Iwate Medical University; Morioka Japan
2. Division of Gastroenterology; Matsuyama Red Cross Hospital; Matsuyama Japan
3. Department of Pathology; Matsuyama Red Cross Hospital; Matsuyama Japan
4. Department of Human Pathology; Juntendo University School of Medicine; Tokyo Japan
5. Division of Gastroenterology; Fukuoka Sanno Hospital; Fukuoka Japan
6. Department of Diagnostic Pathology; Iwate Medical University; Morioka Japan