1. Department of Cardiology, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
2. Department of Cardiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
3. Department of Applied Statistics, Gachon University, Seongnam, Korea.
4. Department of Radiology, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.