1. Department of Radiology, Ajou University School of Medicine, Suwon, Korea.
2. Department of Radiology, Yonsei University Medical College, Seoul, Korea.
3. Division of Radiology, The Cleveland Clinic Foundation, Cleveland, OH, U.S.A.
4. Division of Radiology, Schering AG, Diagnostic Imaging Division, Contrast Media Research, Berlin, Germany.
5. Department of Radiology, University of Ulsan College of Medicine, Seoul, Korea.
6. Department of Cardiology, Ajou University School of Medicine, Suwon, Korea.