1. Department of Radiology, Hospital of the University of Pennsylvania, Philadelphia, PA.
2. Department of Radiology, University of Missouri Health System, One Hospital Dr, Columbia, MO 65212.
3. Department of Radiology and Medical Imaging, University of Virginia Health System, Charlottesville, VA.
4. Department of Public Health Sciences, University of Virginia Health System, Charlottesville, VA.
5. Department of Urology, University of Virginia Health System, Charlottesville, VA.