1. Division of Cardiology, Department of Internal Medicine, Ulsan Medical Center, Ulsan, Korea.
2. Department of Cardiology, Peking University Shougang Hospital, Shijingshan District, Beijig, China.
3. Division of Cardiology, Department of Internal Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
4. Department of Biomedical Engineering, College of Information-Bio Convergence Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan, Korea.
5. East Lancashire Hospitals NHS Trust, Blackburn, Lancashire, UK.