1. Okayama Heart Clinic (Kamikawa); Okayama; Japan
2. Department of Cardiovascular Medicine (Miyoshi, Sangawa, Nakamura, Ito); Okayama University Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences; Okayama; Japan
3. Department of Cardiology (Doi, Noguchi); Kagawa Prefectural Central Hospital; Takamatsu; Japan
4. Department of Cardiology (Orita); Sumitomo Besshi Hospital; Niihama; Japan
5. Department of Cardiology (Nakatsu); Kagawa-ken Saiseikai Hospital; Kagawa; Japan
6. International Center (Hirohata); Okayama University; Okayama; Japan
7. Department of Medical Technology (Kusachi); Okayama University Graduate School of Health; Okayama; Japan