Total Prostate Specific Antigen Stability Confirmed After Long-Term Storage of Serum at −80CGonzalgo, Mark L.Author informationDepartment of Urology, The James Buchanan Brady Urological Institute, The Johns Hopkins Hospital, Baltimore, MarylandJournal of Urology 180(2):p 537, August 2008.Copyright © 2008 by the American Urological Association, Inc.