1. Department of Urology, Mayo Clinic, Phoenix, AZ, USA
2. Department of Health Services Research, Mayo Clinic, Rochester, MN, USA
3. Department of Urology, Mayo Clinic, Rochester, MN, USA
4. Division of Urology, John H. Stroger Jr. Hospital of Cook County, Chicago, IL, USA
5. Department of Urology, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA