[1] NIH, Dept Diagnost Radiol, Special Procedures Div, Ctr Clin, Bethesda, MD 20892 USA
[2] Univ Rochester, Sch Med & Dent, Dept Diagnost Radiol, Rochester, NY 14642 USA
[3] NCI, Surg Branch, NIH, Bethesda, MD 20892 USA
[4] NCI, Urol Oncol Branch, NIH, Bethesda, MD 20892 USA