1. Department of Cardiovascular Medicine Sapporo City General Hospital Sapporo Japan
2. UBE Kohsan Central Hospital Ube Japan
3. Department of Cardiovascular Medicine Hoshi General Hospital Koriyama Japan
4. Department of Cardiovascular Medicine National Cerebral and Cardiovascular Center Suita Japan
5. Division of Cardiovascular Medicine, Department of Medicine Jichi Medical University School of Medicine Shimotsuke Japan
6. Division of Cardiology, Department of Medicine and Clinical Science Yamaguchi University Graduate School of Medicine Yamaguchi Japan
7. Department of Cardiovascular Medicine Chiba University Graduate School of Medicine Chiba Japan
8. Department of Heart Rhythm Management University of Occupational and Environmental Health Kitakyushu Japan
9. Department of Cardiovascular Medicine Nippon Medical School Bunkyo City Japan