1. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan
2. Department of Preventive Medicine and Epidemiologic Informatics, National Cerebral and Cardiovascular Center, Suita, Osaka, Japan
3. Department of Cardiology, Miyazaki Medical Association Hospital, Miyazaki, Miyazakai, Japan
4. Department of Internal Medicine, Sakurajyuji Yatsushiro Rehabilitation Hospital, Yatsushiro, Kumamoto, Japan
5. Department of Cardiology, Sakakibara Heart Institute, Fuchu, Tokyo, Japan
6. Department of Cardiovascular Medicine, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan