1. Fourth Department of Internal Medicine Teikyo University School of Medicine Kawasaki Japan
2. The Department of Cardiology The Jikei University School of Medicine Tokyo Japan
3. Heart Rhythm Center Tokyo Medical and Dental University Tokyo Japan
4. Cardiovascular Center Sakurabashi Watanabe Hospital Osaka Japan
5. Division of Cardiology Gunma Prefectural Cardiovascular Center Gunma Japan
6. Heart Rhythm Center Fukuoka Sanno Hospital Fukuoka Japan
7. Division of Cardiology Nippon Medical School Tokyo Japan
8. Division of Cardiology Tokai University Hachioji Hospital Hachioji Japan
9. Cardiovascular Division Faculty of Medicine University of Tsukuba Tsukuba Japan
10. Department of Cardiology Tokyo Women's Medical University Tokyo Japan
11. Division of Cardiology Saiseikai Kumamoto Hospital Kumamoto Japan