1. Department of Internal Medicine and Cardiology, Graduate School of Medicine, Osaka City University, Osaka, Japan.
2. Department of Cardiology, Osaka Hospital of Japan Seafarers Relief Association, Osaka, Japan.
3. Department of Cardiology, Osaka City General Hospital, Osaka, Japan.
4. Department of Internal medicine, Tane General Hospital, Osaka, Japan.
5. Department of Cardiology, Ikuwakai Memorial Hospital, Osaka, Japan.
6. Division of Cardiology, Bell Land General Hospital, Sakai, Japan.
7. Department of Internal Medicine, Izumi City Hospital, Izumi, Osaka, Japan.
8. Department of Internal Medicine, Division of Cardiology, Higashisumisyoshi Morimoto Hospital, Osaka, Japan.
9. Department of Cardiovascular Medicine, Wakayama Medical University, Wakayama, Japan.
10. Department of Cardiology, Tsukazaki Hospital, Hyougo, Japan.