1. Department of Cardiology, Chungnam National University Sejong Hospital, Chungnam National University School of Medicine, Sejong, Korea.
2. Department of Nuclear Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
3. Division of Cardiology, Department of Internal Medicine, The Catholic University of Korea, Eunpyeong St. Mary's Hospital, Seoul, Korea.
4. Department of Cardiology, Daejeon St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
5. Division of Cardiology, Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.