1. Kawaguchi Municipal Medical Center, Kawaguchi, Japan;
2. Division of Cardiology, Nihon University Itabashi Hospital, Tokyo, Japan;
3. Department of Cardiology, Nihon University Hospital, Tokyo, Japan;
4. Yokohama Chuo Hospital, Yokohama, Japan;
5. Sekishindo Hospital, Kawagoe, Japan;
6. Asaka Medical Center, Asaka, Japan;
7. Tokyo Rinkai Hospital, Tokyo, Japan;
8. Kasukabe Municipal Hospital, Kasukabe, Japan;
9. Yasuda Hospital, Tokyo, Japan;
10. Makita General Hospital, Tokyo, Japan;
11. Itabashi Medical Association Hospital, Tokyo, Japan;
12. Ukima Central Hospital, Tokyo, Japan;
13. Itou Cardiovascular Clinic, Tokorozawa, Japan;
14. Kondo Clinic, Tokyo, Japan;
15. Keiai Clinic, Tokyo, Japan;
16. Ohno Medical Clinic, Tokyo, Japan;
17. Onikura Clinic, Yachiyo, Japan