Affiliation: | (1) Department of Radiology, Box 170, University of Virginia Health Sciences Center, Charlottesville, VA 22908, USA Tel. 8 04-9 24-97 19; fax 8 04-9 82-16 18, US;(2) Department of Neurosurgery, University of Virginia, Charlottesville, Virginia, USA, US;(3) Department of Radiology, University of Maryland, Baltimore, Maryland, USA, TP |