1. Division of Cardiology, Department of Internal Medicine, Seoul National University Hospital, 101, Daehak-ro, Jongno-gu, Seoul 03080, Korea
2. Division of Cardiology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Gangnam-gu, Seoul 06351, Korea
3. Cardiovascular Center and Department of Internal Medicine, Seoul National University Bundang Hospital, Bundang-gu, Seongnam 13620, Korea
4. Department of Radiology, Seoul National University Hospital, Jongno-gu, Seoul 03080, Korea