1. Mid Atlantic Permanente Medical Group, Baltimore, Maryland
2. Centers for Disease Control and Prevention, Atlanta, Georgia
3. Department of Urology, Emory University, Atlanta, Georgia
4. Division of Urology, University of Utah, Salt Lake City, Utah
5. Department of Urology, Stanford University, Palo Alto, California
6. Department of Urology, Yale University, New Haven, Connecticut
7. Department of Urology, University of Kansas, Kansas City, Kansas
8. Department of Urology, University of Illinois, Chicago, Illinois