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; Department of Urology, Yonsei University Wonju College of Medicine, Wonju, Republic of Korea.
3 Department of Urology, University of Minnesota, Minneapolis, MN, USA.