1. Department of Cardiology, Inagi Municipal Hospital
2. Department of Cardiology, Ashikaga Red Cross Hospital, Ashikaga and Yokozuka Heart Clinic
3. Department of Cardiology, Yokohama Municipal Citizen's Hospital
4. Department of Cardiology, Hino Municipal Hospital
5. Department of Internal Medicine, Sodegaura Satsukidai Hospital
6. Department of Cardiology, National Hospital Organization Tokyo National Hospital
7. Department of Internal Medicine, Keio University School of Medicine