1. Division of Cardiology, Nephrology, Pulmonology and Neurology Department of Internal Medicine Asahikawa Medical University Asahikawa Japan
2. Division of Community Medicine and Epidemiology Department of Health Science Asahikawa Medical University Asahikawa Japan
3. Department of Internal Medicine Fukagawa Municipal Hospital Fukagawa Japan
4. Department of Internal Medicine Asahikawa Rehabilitation Hospital Asahikawa Japan
5. Department of Cardiology Asahikawa Kosei General Hospital Asahikawa Japan
6. Department of Cardiology Hokkaido Kitami Hospital Kitami Japan
7. Department of Cardiology Municipal Ashibetsu Hospital Ashibetsu Japan