1. Department of Pathology, Keio University School of Medicine, Tokyo, Japan,
2. Department of Pathology, The Jikei University School of Medicine, Tokyo, Japan,
3. Department of Pathology, The Cancer Institute Hospital of Japanese Foundation for Cancer Research (JFCR), Tokyo, Japan,
4. Division of Gastroenterology and Hepatology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan,
5. Center for Preventive Medicine, Keio University School of Medicine, Tokyo, Japan