Division of Cardiology, Severance Cardiovascular Hospital, Integrative Research Center for Cerebrovascular and Cardiovascular Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea. Division of Cardiology, Department of Internal Medicine, Hanyang University Seoul Hospital, Seoul, South Korea. Division of Cardiology, Department of Internal Medicine, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Republic of Korea. limsh@catholic.ac.kr. Catholic Research Institute for Intractable Cardiovascular Disease, College of Medicine, The Catholic University of Korea, Bucheon St. Mary's Hospital327 Sosa-Ro, Wonmi-guGyunggi-do, Bucheon-si, 14647, Republic of Korea. limsh@catholic.ac.kr. Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Republic of Korea. Division of Cardiology, Department of Internal Medicine, Boramae Medical Center, Seoul National University College of Medicine, Seoul, Korea. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Republic of Korea. Division of Cardiology, Department of Internal Medicine, Wonkwang University Sanbon Hospital, Wonkwang University College of Medicine, Gunpo, Republic of Korea. Department of Internal Medicine, Kyungpook National University Hospital, Daegu, South Korea. School of Medicine, Kyungpook National University, Daegu, South Korea. Division of Nephrology, Department of Internal Medicine, Korea University Guro Hospital, Seoul, South Korea. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea, Seoul, Korea. Department of Cardiovascular Medicine, Chonnam National University Hospital, Gwangju, Korea. Department of Family Medicine, Severance Hospital, Yonsei University College of Medicine, Seoul, Republic of Korea. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea. Hallym University, Dongtan Hospital, Gyeonggi-do, Korea. Division of Cardiology, Department of Internal Medicine, Hanyang University Seoul Hospital, Seoul, Korea. Department of Neurology, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, South Korea.