1. Cardiovascular Center, Sakurabashi Watanabe Hospital
2. Fourth Department of Internal Medicine, Teikyo University Mizonokuchi Hospital
3. Cardiovascular Division, Faculty of Medicine, University of Tsukuba
4. Department of Cardiology, Tokyo Women’s Medical University
5. Division of Cardiology, Gunma Prefectural Cardiovascular Center
6. Heart Rhythm Center, Fukuoka Sanno Hospital
7. Department of Cardiovascular Medicine, Nippon Medical School
8. Department of Cardiology, The Jikei University School of Medicine
9. Division of Cardiology, Department of Medicine, Tokai University Hachioji Hospital
10. Division of Cardiology, Hirosaki University Graduate School of Medicine