1. Department of Cardiovascular Medicine, Chiba University Graduate School of Medicine
2. Department of Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University
3. Department of Cardiovascular Medicine, Shinshu University School of Medicine
4. Department of Cardiology, Tokai University School of Medicine
5. School of Medicine and Graduate School, International University of Health and Welfare
6. Second Department of Internal Medicine, University of Toyama
7. Department of Cardiology, Teikyo University Hospital