1. Division of Cardiology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
2. Department of Cardiology, CHA Bundang Medical Center, CHA University, Seongnam, Korea.
3. Department of Computer Science and Statistics, Daegu University, Gyeongsan, Korea.
4. Liverpool Centre for Cardiovascular Science, University of Liverpool and Liverpool Heart & Chest Hospital, Liverpool, United Kingdom.