1. Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine
2. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center Hospital
3. Department of Cardiovascular Medicine, Sendai Medical Center
4. Department of Cardiovascular Medicine, South Miyagi Medical Center
5. Department of Cardiovascular Medicine, Sendai City Hospital
6. Division of Cardiology, Tohoku Rosai Hospital
7. Cardiovascular Center, Tohoku Kouseinenkin Hospital
8. Department of Cardiovascular Medicine, Saka General Hospital
9. Department of Cardiovascular Medicine, Osaki Citizen Hospital
10. Department of Cardiovascular Medicine, Japanese Red Cross Ishinomaki Hospital
11. Department of Cardiovascular Medicine, Kesennuma City Hospital