1. Division of Cardiology, Department of Internal Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, 50, Irwon-dong, Gangnam-gu, Seoul 135–710, Korea
2. Department of Internal Medicine and Cardiovascular Center, Seoul National University Hospital, 101 Daehang-ro, Chongno-gu, Seoul 110-744, Korea
3. Institute on Aging, Seoul National University, 50, Irwon-dong, Gangnam-gu, Seoul 135–710, Korea
4. Department of Cardiology, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, South Korea
5. Department of Medicine, Keimyung University Dongsan Medical Center, Daegu, South Korea
6. Department of Medicine, Inje University Ilsan Paik Hospital, Goyang, South Korea
7. Department of Cardiology, The Second Affiliated Hospital, School of Medicine, Zhejiang University, China
8. Division of Biostatistics, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD, USA
9. Department of Cardiology, Nanjing First Hospital, Nanjing Medical University, Nanjing, China
10. Guangdong Cardiovascular Institute, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, Guangdong, China
11. Department of Cardiology, Tokyo Medical University, Tokyo, Japan
12. Kokura Memorial Hospital, Kitakyuku, Japan
13. Department of Cardiology, Gifu Heart Center, Gifu, Japan
14. Department of Cardiology, Aichi Medical University, Nagakute, Japan
15. Wakayama Medical University, Wakayama, Japan