1. Department of Internal Medicine, Seoul National University Hospital, Seoul, Republic of Korea
2. Department of Statistics and Actuarial Science, Soongsil University, Seoul, Republic of Korea
3. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Republic of Korea
4. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Chest and Heart Hospital, Liverpool, U.K.
5. Department of Clinical Medicine, Aalborg University, Aalborg, Denmark