1. Division of Cardiology, Department of Internal Medicine, The Armed Forces Capital Hospital, Seongnam, Korea.
2. Division of Cardiology, Department of Internal Medicine, Cardiovascular Imaging Center, Cardiac and Vascular Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
3. Department of Vascular Surgery, Cardiovascular Imaging Center, Cardiac and Vascular Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
4. Division of Cardiovascular Diseases, Mayo Clinic College of Medicine, Rochester, MN, USA.