1. Department of Cardiovascular Medicine, Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences
2. Department of Cardiology, Kansai Electric Power Hospital
3. Department of Internal Medicine, Kihara Cardiovascular Clinic
4. Cardiovascular Center, Sakurabashi Watanabe Hospital
5. Heart Center, Tokyo Bay Urayasu/Ichikawa Medical Center
6. Department of Cardiology, Nishinomiya Watanabe Cardiovascular Center