1. Department of Emergency Medicine, George Washington University School of Medicine & Health Sciences, Washington, DC
2. The George Washington University Biostatistics Center, Washington, DC
3. Department of Emergency Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
4. Department of Emergency Medicine, Thomas Jefferson University, Philadelphia, Pennsylvania
5. Department of Emergency Medicine, University of Alabama at Birmingham School of Medicine, Birmingham
6. National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland
7. Department of Urology, George Washington University School of Medicine & Health Sciences, Washington, DC
8. Department of Urology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
9. National Institute of General Medical Sciences, National Institutes of Health, Bethesda, Maryland