1. Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine
2. Department of Cardiology, Mie University Graduate School of Medicine
3. Department of Internal Medicine, National Cardiovascular Center
4. Second Department of Internal Medicine, Nagasaki University
5. Department of Chest Medicine, Chiba University
6. Department of Internal Medicine, Sumida Shuko-en Facility
7. Kanto Central Hospital