1. Department of Cardiology, Tenri Hospital, 200 Mishima-cho, Tenri, Nara, Japan
2. Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Kyoto, Japan
3. Department of Clinical Epidemiology, Hyogo College of Medicine, Nishinomiya, Japan
4. Department of Cardiology, Kobe City Medical Center General Hospital, Kobe, Japan
5. Department of Cardiology, Kurashiki Central Hospital, Kurashiki, Japan
6. Department of Cardiology, Kokura Memorial Hospital, Kitakyusyu, Japan
7. Department of Cardiovascular Center, Osaka Red Cross Hospital, Osaka, Japan
8. Cardiovascular Center, Kitano Hospital, Tazuke Kofukai Medical Research Institute, Osaka, Japan
9. Department of Cardiology, Kansai Electric Power Hospital, Osaka, Japan
10. Department of Cardiovascular Surgery, Kokura Memorial Hospital, Kitakyushu, Japan
11. Department of Cardiovascular Surgery, Shizuoka City Shizuoka Hospital, Shizuoka, Japan
12. Department of Cardiovascular Surgery, Kobe City Medical Center General Hospital, Kobe, Japan
13. Department of Cardiovascular Surgery, Kurashiki Central Hospital, Kurashiki, Japan
14. Department of Cardiovascular Surgery, Tenri Hospital, Tenri, Japan
15. Department of Cardiovascular Surgery, Kindai University Nara Hospital, Ikoma, Japan
16. Department of Cardiovascular Surgery, Mitsubishi Kyoto Hospital, Kyoto, Japan
17. Department of Cardiovascular Surgery, Kindai University Hospital, Osakasayama, Japan
18. Department of Cardiovascular Surgery, Kishiwada City Hospital, Kishiwada, Japan
19. Department of Cardiovascular Surgery, Osaka Red Cross Hospital, Osaka, Japan
20. Department of Cardiovascular Surgery, Shizuoka General Hospital, Shizuoka, Japan
21. Department of Cardiovascular Surgery, Japan Red Cross Wakayama Medical Center, Wakayama, Japan
22. Department of Cardiovascular Surgery, National Hospital Organization Kyoto Medical Center, Kyoto, Japan
23. Department of Cardiovascular Surgery, Cardiovascular Center, Kitano Hospital, Tazuke Kofukai Medical Research Institute, Osaka, Japan
24. Department of Cardiovascular Surgery, Hyogo Prefectural Amagasaki General Medical Center, Amagasaki, Japan
25. Department of Cardiovascular Surgery, Rakuwakai Otowa Hospital, Kyoto, Japan
26. Department of Cardiovascular Surgery, Shiga Medical Center for Adults, Moriyama, Japan
27. Department of Cardiovascular Surgery, Hamamatsu Rosai Hospital, Hamamatsu, Japan
28. Department of Cardiovascular Surgery, Otsu Red Cross Hospital, Otsu, Japan
29. Department of Cardiovascular Surgery, Kyoto University Graduate School of Medicine, Kyoto, Japan