Affiliation: | 1. Department of Cardiology, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, Republic of Korea;2. Department of Cardiology, Seoul National University Hospital, Seoul, Republic of Korea;3. Department of Cardiology, Kyungpook National University Hospital, Daegu, Republic of Korea;4. Department of Cardiology, Pusan National University Hospital, Busan, Republic of Korea |