1. Division of Cardiology, Hallym University Kangnam Sacred Heart Hospital, Seoul, Korea.
2. Division of Cardiology, Department of Internal Medicine, Pusan National University Hospital, Busan, Korea.
3. Department of Internal Medicine, Daejeon Eulji Medical Center, Eulji University School of Medicine, Daejeon, Korea.
4. Division of Cardiology, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea.