1. Department of Cardiology, Tokyo Medical University Ibaraki Medical Center
2. Department of Cardiology, Kameda Medical Center
3. Department of Cardiology, Tokyo Saiseikai Central Hospital
4. Department of Cardiology, Takatsu General Hospital
5. Department of Cardiology, Teine Keijinkai Hospital
6. Department of Cardiology, Japanese Red Cross Kyoto Daini Hospital
7. Department of Cardiovascular, Sakurakai Takahashi Hospital
8. Department of Cardiology, Rakuwakai Otowa Hospital
9. Department of Cardiology, Kasukabe Chuo General Hospital
10. Division of Cardiovascular Medicine, Toho University Ohashi Medical Center