1. Department of Cardiology, Korea University Ansan Hospital, Ansan-si, Republic of Korea
2. Institute for Health Promotion, Department of Epidemiology and Health Promotion, Yonsei University Graduate School of Public Health, Seoul, Republic of Korea
3. Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
4. Cardiovascular Center, Korea University Guro Hospital, Seoul, Republic of Korea