1. Department of Cardiovascular Medicine, The University of Tokyo Hospital
2. Division of Cardiology, Mitsui Memorial Hospital
3. Department of Cardiovascular Medicine, Asahi General Hospital
4. Department of Cardiology, Sakakibara Heart Institute
5. Division of Cardiovascular Medicine, Saitama Medical Center, Jichi Medical University
6. Department of Cardiology, Tokyo Bay Urayasu Ichikawa Medical Center
7. Department of Cardiology, JR General Hospital
8. Department of Cardiology, NTT Medical Center Tokyo