1. Division of Gastroenterology and Hepatology; Department of Internal Medicine; The Jikei University School of Medicine; Tokyo Japan
2. Department of Pathology; The Jikei University School of Medicine; Tokyo Japan
3. Division of Clinical Pathology; Tohoku Welfare Pension Hospital; Sendai Japan
4. Department of Laboratory Medicine; The Jikei University School of Medicine; Tokyo Japan
5. Kaijo Bldg. Clinic; Tokyo Japan
6. Institute of Clinical Medicine and Research (ICMR); The Jikei University School of Medicine; Chiba Japan
7. Division of Gastroenterology and Hepatology, Kashiwa Hospital; The Jikei University School of Medicine; Chiba Japan
8. Division of Gastroenterology and Hepatology; Katsushika Medical Centre; The Jikei University School of Medicine; Tokyo Japan