1. Department of Cardiology, Sakakibara Heart Institute
2. Department of Cardiology, Saiseikai Central Hospital
3. Department of Cardiovascular Medicine, Faculty of Medicine, Kyorin University
4. Department of Cardiology, Saitama Medical University, International Medical Center
5. Department of Cardiology, St. Luke's International Hospital
6. Department of Cardiology, National Defense Medical College
7. Department of Cardiology, Keio University School of Medicine