1. Duke Cancer Institute, Durham, North Carolina
2. Department of Urology, Shiraz University of Medical Sciences, Shiraz, Iran
3. Durham Veterans Affairs Medical Center, Durham, North Carolina
4. Department of Biostatistics and Bioinformatics, Duke University School of Medicine, Durham, North Carolina
5. Center for Integrated Research on Cancer and Lifestyle, Cedars-Sinai Medical Center, Los Angeles, California