1. Research Team for Geriatric PathologyTokyo Metropolitan Institute of Gerontology
2. Department of PathologyTokyo Metropolitan Geriatric Hospital
3. Institute of PathologyKlinikum Bayreuth Bayreuth Germany
4. Department of Gastrointestinal and Hepato‐Biliary‐Pancreatic SurgeryNippon Medical School Tokyo
5. Department of GastroenterologyNippon Medical School Chiba Hokusoh Hospital Inzai
6. Department of Digestive Tract and General SurgerySaitama Medical CenterSaitama Medical University Saitama
7. Kurokawa General Hospital Kurokawa Japan