1. Tokyo HP Study Group; Department of Gastroenterology; Juntendo University School of Medicine; Tokyo Japan
2. Tokyo Hp Study Group, Department of Gastrointestinal Endoscopy; Tama-Nagayama University Hospital of Nippon Medical School; Tokyo Japan
3. Tokyo HP Study Group; Third Department of Internal Medicine; Kyorin University School of Medicine; Tokyo Japan
4. Tokyo HP Study Group; Endoscopy Center; Tokyo Medical University Hospital; Tokyo Japan
5. Tokyo Hp Study Group, Department of General Medicine and Primary Care; Tokyo Medical University Hospital; Tokyo Japan
6. Tokyo HP Study Group; Division of Gastroenterology and Hepatology; Department of Internal Medicine; Keio University School of Medicine; Tokyo Japan
7. Tokyo HP Study Group; Division of Gastroenterology; National Hospital Organization Tokyo Medical Center; Tokyo Japan
8. Tokyo HP Study Group; Department of Surgery; Nerima General Hospital; Tokyo Japan
9. Tokyo HP Study Group; Department of Gastroenterology; Yotsuya Medical Cube; Tokyo Japan
10. Tokyo HP Study Group; Division of Endoscopy; Department of Internal Medicine; St. Luke's International Hospital; Tokyo Japan
11. Tokyo HP Study Group; Department of Gastroenterology and Hepatology; Nihon University, School of Medicine; Tokyo Japan
12. Tokyo HP Study Group; Torii Medical Clinic; Tokyo Japan
13. Tokyo HP Study Group; Department of Gastroenterology and Hepatology; The Jikei University Kashiwa Hospital; Chiba Japan
14. Tokyo HP Study Group; Department of Gastroenterology Tokai University School of Medicine; Kanagawa Japan
15. Tokyo HP Study Group; Foundation for Detection of Early Gastric Carcinoma; Tokyo Japan