6 Department of Urology, Mayo Clinic, Rochester, Minnesota, USA.
7Department of Laboratory Medicine and Pathology, University of Alberta, Edmonton, Alberta, Canada.
Address correspondence to: Zhenkun Lou or Robert W. Mutter, Mayo Clinic, Kellen Building 401,200 First Street SW, Rochester, Minnesota 55,905, USA. Phone: 507.284.2702; Email: [email protected] (ZL). Phone: 507.284.3261; Email: [email protected] (RWM).