1. Saiseikai Central Hospital, Tokyo, Japan
2. Department of Internal Medicine, Kitazato University Sagamihara, Kanagawa
3. Department of Psychiatry, Showa University Tokyo
4. Institute for Diabetes Care and Research, Asahi Life Foundation Tokyo
5. Third Department of Internal Medicine, Showa University Tokyo
6. Institute of Clinical Medicine, University of Tsukuba Tsukuba-City
7. Third Department of Internal Medicine, Tokyo University Tokyo
8. Department of Medicine, Metabolism and Endocrinology, Juntendo University Tokyo, Japan