title: Author Reply.
authors.affiliation: Department of Radiology, University of North Carolina, Chapel Hill, NC.
authors.forename: Clayton W
authors.initials: CW
authors.lastname: Commander
authors.affiliation: Department of Urology, University of North Carolina, Chapel Hill, NC.
authors.forename: David C
authors.initials: DC
authors.lastname: Johnson
authors.affiliation: Department of Urology, University of North Carolina, Chapel Hill, NC.
authors.forename: Mathew C
authors.initials: MC
authors.lastname: Raynor