1. Department of Radiology, Sung-Ae General Hospital, Korea.
2. Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
3. Department of Surgery, Cardiovascular Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.
4. Department of Internal Medicine, Cardiovascular Center, Samsung Medical Center, Sungkyunkwan University School of Medicine, Korea.