1 Division of Cardiology, Department of Internal Medicine, Wonju College of Medicine, Yonsei University, Wonju, Korea.
2 Division of Cardiovascular Medicine, Calhoun Cardiovascular Center, University of Connecticut School of Medicine, Farmington, CT, USA.
3 Division of Cardiovascular Medicine, Calhoun Cardiovascular Center, University of Connecticut School of Medicine, Farmington, CT, USA. azrin@uchc.edu.