1. Department of Cardiovascular Medicine, Gunma University Graduate School of Medicine
2. Cardiovascular Division, School of Medicine, University of Tsukuba
3. Department of Cardiology, Nagoya University Graduate School of Medicine
4. Department of Cardiology, Yamanashi Kosei Hospital
5. Department of Cardiology, Ogaki Municipal Hospital
6. Department of Cardiology, Kameda Medical Center
7. Department of Cardiology, Yokohama Minami Kyosai Hospital