1. Department of Urology, Medstar Georgetown University Hospital, Washington, DC, USA.
2. Department of Urology, Medstar Washington Hospital Center, Washington, DC, USA.
3. MedStar Health Research Institute, Hyattsville, MD, USA.
4. School of Medicine, Georgetown University, Washington, DC, USA.
5. Department of Biostatistics, Bioinformatics, and Biomathematics, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC, USA.