Philipp Dahm1, Vikram Narayan2, Jae Hung Jung3. 1. Urology Section, Minneapolis Veterans Healthcare System, Minneapolis, MN, USA; Department of Urology, University of Minnesota, Minneapolis, MN, USA. Electronic address: pdahm@umn.edu. 2. Urology Section, Minneapolis Veterans Healthcare System, Minneapolis, MN, USA; Department of Urology, University of Minnesota, Minneapolis, MN, USA. 3. Urology Section, Minneapolis Veterans Healthcare System, Minneapolis, MN, USA; Department of Urology, University of Minnesota, Minneapolis, MN, USA; Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.