1. Institute of Medical Research, Scottsdale, Arizona.
2. Cleveland Clinic Lerner College of Medicine of Case Western Reserve University, Cleveland, Ohio.
3. Department of Urology, University of Chile, Santiago, Chile.
4. Department of Radiology, University of Chile, Santiago, Chile.
5. Department of Urology, Mayo Clinic Rochester, Rochester, Minnesota.
6. Department of Radiology, Mayo Clinic Scottsdale, Scottsdale, Arizona.