1. Department of Urology, MedStar Washington Hospital Center, 110 Irving Street NW, Suite 3B-19, Washington, DC 20010, USA
2. Department of Urology, State University of New York Upstate Medical University, 750 East Adams Street, Syracuse, NY 13210, USA
3. Division of Urology, University of Colorado, 12605 E. 16th Avenue, Aurora, CO 80045, USA