1. Division of Cardiology, Department of Internal Medicine, Seoul National University Bundang Hospital, Seongnam, Korea.
2. Division of Cardiology, Heart Vascular Stroke Institute, Samsung Medical Center/Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Division of Cardiology, Hallym University Sacred Heart Hospital/Hallym University College of Medicine, Anyang, Korea.
4. Cardiovascular Center, Korea University Guro Hospital, Seoul, Korea.
5. Division of Cardiology, Kyung Hee University Hospital, Seoul, Korea.
6. Department of Computer Science and Engineering, Kyung Hee University, Yongin, Korea.