Jin Kyung Oh1, Jae Hyeong Park2, In Whan Seong1. 1. Department of Cardiology in Internal Medicine, Chungnam National University School of Medicine, Chungnam National University Hospital, Daejeon, Korea. 2. Department of Cardiology in Internal Medicine, Chungnam National University School of Medicine, Chungnam National University Hospital, Daejeon, Korea. jaehpark@cnuh.co.kr.