1. Department of Cardiology; Busan Paik Hospital; University of Inje College of Medicine; Busan; Korea
2. Department of Cardiology; Maryknoll Medical Center; Busan; Korea
3. Department of Internal Medicine; Pusan National University Hospital; Busan; Korea
4. Department of Cardiology and Research Institute for Convergence of Biomedical Science and Technology; Pusan National University Yangsan Hospital; Yangsan; Korea