1. Department of Cardiovascular Medicine Sapporo City General Hospital Sapporo Japan
2. UBE Kohsan Central Hospital Upe 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 Ube Japan
7. Department of Heart Rhythm Management University of Occupational & Environmental Health Kitakyushu Japan
8. Cardiovascular Division Faculty of Medicine University of Tsukuba Tsukuba Japan