1. From the Department of Urology, Northwestern University (SEE, JRR, NDS, RBN), Chicago, and Department of Urology, Hines Veterans Hospital (SCC), and Departments of Urology (JK, RCF, SCC) and Pathology (MP), Loyola University Medical Center, Maywood, Illinois, and University of Tennessee Medical Center (WBW), Knoxville, Tennessee