1. Department of Medicine, Shiga University of Medical Science, Otsu 520-2192, Japan
2. Department of Public Health, Shiga University of Medical Science, Otsu 520-2192, Japan
3. Center for Epidemiologic Research in Asia, Shiga University of Medical Science, Otsu 520-2192, Japan
4. Japanese Red Cross Otsu Hospital, Otsu 520-8511, Japan
5. Department of Cardiology, Saiseikai Shiga Hospital, Ritto 520-3046, Japan
6. Shiga Medical Association, Ritto 520-3031, Japan
7. Wakakusa Clinic, Kusatsu 525-0045, Japan
8. Ohnishi Clinic, Kusatsu 525-0054, Japan