1. Department of Urology, Columbia University Medical Center, New York, New York.
2. Department of Urology, University of Texas Southwestern Medical Center, Dallas, Texas.
3. Department of Urology, University of California Irvine Medical Center, Irvine, California.
4. Department of Biostatistics, Columbia University Medical Center, New York, New York.
5. Department of Radiology, University of California Irvine Medical Center, Irvine, California.
6. Department of Radiology, Columbia University Medical Center, New York, New York.