1. Department of Urology University of Michigan Ann Arbor Michigan USA
2. Arbor Research Collaborative for Health Ann Arbor Michigan USA
3. Departments of Surgery and Anesthesiology, Division of Urologic Surgery Washington University School of Medicine St Louis Missouri USA
4. Department of Obsterics and Gynecology Duke University Medical Center Durham North Carolina USA
5. National Institute of Diabetes and Digestive and Kidney Diseases Bethesda Maryland USA
6. Department of Urology University of Washington Seattle Washington USA