1. Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine
2. Division of Cardiology, Department of Medicine and Clinical Science, Yamaguchi University Graduate School of Medicine
3. Department of Cardiovascular Medicine, Juntendo University School of Medicine
4. Cardiovascular Division of Internal Medicine, National Cerebral and Cardiovascular Center
5. Division of Cardiovascular Medicine, Saiseikai Futsukaichi Hospital