1. Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine
2. Department of Chest Medicine, Chiba University
3. The First Department of Internal Medicine, Mie University
4. Department of Internal Medicine, National Cardiovascular Center
5. The Second Department of Internal Medicine, Nagasaki University
6. Department of Medicine, Ise Keio Hospital, Keio Universit
7. Kanto Central Hospital