1. Division of Gastroenterology and Hepatology, Department of Internal Medicine The Jikei University School of Medicine Tokyo Japan
2. Division of Gastroenterology and Hepatology, Department of Internal Medicine The Jikei Katsushika Medical Center Tokyo Japan
3. Department of Laboratory Medicine The Jikei University School of Medicine Tokyo Japan
4. Division of Pathology The Jikei University School of Medicine Tokyo Japan
5. Department of Pathology Kitasato University School of Medicine Sagamihara Kanagawa Japan