1. Department of Surgery; Division of Urology; Southern Illinois University School of Medicine; Springfield IL USA
2. Simmons Cancer Institute; Southern Illinois University School of Medicine; Springfield IL USA
3. Population Science Program; Center for Clinical Research; Southern Illinois University School of Medicine; Springfield IL USA
4. Department of Medical Microbiology, Immunology and Cell Biology; Southern Illinois University School of Medicine; Springfield IL USA
5. Department of Family and Community Medicine; Southern Illinois University School of Medicine; Springfield IL USA