Institution: | Department of Neurological Surgery, Univ. Pittsburgh Medical Center, University of Pittsburg, Pittsburgh, PA 15261, U.S.A.;Department of Anesthesiology/CCM, Univ. Pittsburgh Medical Center, University of Pittsburg, Pittsburgh, PA 15261, U.S.A.;Department of Radiology, Univ. Pittsburgh Medical Center, University of Pittsburg, Pittsburgh, PA 15261, U.S.A. |