1. Department of Radiology, George Washington School of Medicine and Health Sciences, Washington, DC.
2. Department of Radiology, Division of Abdominal Radiology, Michigan Medicine, University of Michigan, Ann Arbor, MI.
3. Department of Radiology and Biomedical Imaging, University of California, San Francisco, 505 Parnassus Ave, M-392, San Francisco, CA 94143-0628.
4. Department of Urology, University of California, San Francisco, San Francisco, CA.