1. Division of Cardiology, Department of Medicine, Nihon University School of Medicine
2. Cardiovascular Division, Osaka Police Hospital
3. Cardiovascular Division, Amagasaki Chuou Hospital
4. Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine
5. Department of Cardiology, The Cardiovascular Institute Hospital
6. Cardiovascular Division, Kansai Rosai Hospital
7. Department of Cardiology, Tokyo Medical University Hachioji Medical Center