1. Department of Radiology, Duke University Medical Center, Durham, NC.
2. Department of Radiology, Division of Abdominal Imaging, Stanford University School of Medicine, 300 Pasteur Dr, H1307, Stanford, CA 94305.
3. Department of Biostatistics and Bioinformatics, Duke University Medical Center, Durham, NC.
4. Department of Radiology, University of Washington School of Medicine, Seattle, WA.
5. Carl E. Ravin Advanced Imaging Laboratories, Duke University Medical Center, Durham, NC.