1. Departments of Diabetes, Metabolism, and Endocrinology (Y.T., Y.K., Y.C., S.M., A.A., H.I.), Tokyo 173-0015, Japan
2. Research Team for Geriatric Pathology and Department of Pathology (N.I.-S., K.N., N.I., J.A., K.T.), Tokyo Metropolitan Geriatric Hospital and Institute of Gerontology, Tokyo 173-0015, Japan
3. Pathology (T.Ar.), Tokyo Metropolitan Geriatric Hospital, Tokyo 173-0015, Japan
4. Diabetes Center (T.Ai.), Aizawa Hospital, Matsumoto, Nagano 390-8510, Japan