1. Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
2. Department of Internal Medicine, Busan Medical Center, Busan, Korea.
3. Department of Biostatistics, Pusan National University Hospital, Busan, Korea.
4. Department of Cardiovascular Surgery, Pusan National University Hospital, Busan, Korea.
5. Family Medicine Clinic and Research Institute of Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea.
6. Medical Education Unit and Medical Research Institute, Pusan National University School of Medicine, Yangsan, Korea.