1. Division of Cardiology Osaka General Medical Center 3‐1‐56 Mandaihigashi, Sumiyoshi‐ku Osaka 558‐8558 Japan
2. Division of Cardiology Osaka Rosai Hospital 3‐1179 Nagasonecho, Kita‐ku, Sakai Osaka 591‐8025 Japan
3. Division of Cardiology Osaka Police Hospital 10‐31 Kitayamacho, Tennoji‐ku Osaka 543‐0035 Japan
4. Division of Cardiovascular Medicine Amagasaki‐Chuo Hospital 1‐12‐1 Shioe Amagasaki Hyogo 661‐0976 Japan
5. Department of Medical Informatics Osaka University Graduate School of Medicine 2‐2 Yamadaoka Suita 565‐0871 Japan
6. Division of Cardiology Kawanishi City Hospital 5‐21‐1 Kawanishi Hyogo 666‐0195 Japan
7. Department of Cardiology Rinku General Medical Center 2‐23 Ourai‐kita, Rinku Izumisano Osaka 598‐8577 Japan
8. Department of Cardiovascular Medicine Osaka University Graduate School of Medicine 2‐2 Yamadaoka Suita 565‐0871 Japan