1. The Third Department of Internal Medicine, Teikyo University Chiba Medical Center
2. Department of Cardiology, Kameda Medical Center
3. Department of Cardiology, Toranomon Hospital
4. Department of Cardiology, St. Luke’s International Hospital
5. Department of Cardiology, Shonan Kamakura General Hospital
6. Department of Cardiology, Tokyo Saiseikai Central Hospital
7. Department of Cardiology, Tokyo Medical University
8. Department of Cardiology, Saitama Medical Center
9. Department of Cardiology, Tokyo Medical University, Ibaraki Medical Center