Professor of Surgery
Division of Urology
University of Tennessee Graduate School of Medicine
Knoxville
TN
EDK declares that he has no competing interests.
Dr Edward D. Kim would like to gratefully acknowledge Dr Andrew C. Kramer, Dr Daniel H. Williams, and Dr James K. Kuan, previous contributors to this topic.
Urological Surgeon
Imperial Healthcare NHS Trust
London
UK
JV declares that he has no competing interests.
Professor of Urology
Cellular and Molecular Medicine
The James Buchanan Brady Urological Institute
The Johns Hopkins Hospital
Baltimore
MD
ALB declares that he has no competing interests.
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