1. Department of Internal Medicine, Hakuhokai Central Hospital, Amagasaki, Japan
2. Department of Diabetology, The Sakakibara Heart Institute of Okayama, Okayama, Japan
3. Department of Diabetes, Geriatrics Research and Hospital, Gunma, Japan
4. Health Screening Center, Mitsui Memorial Hospital, Tokyo, Japan
5. Nihonbashi Muromachi Mitsui Tower Midtown Clinic, Tokyo, Japan