[1] Vanderbilt Univ, Med Ctr, Dept Urol Surg, Nashville, TN USA
[2] Vanderbilt Univ, Med Ctr, Dept Pathol, Nashville, TN 37232 USA
[3] Vanderbilt Univ, Med Ctr, Ctr Surg Qual & Outcomes Res, Nashville, TN USA
[4] Univ Michigan, Dept Urol, Ann Arbor, MI 48109 USA