1. From the Neurosurgery Research Group, Biomedicum Helsinki and Department of Neurosurgery, Helsinki University Central Hospital, Helsinki, Finland (S.M., J.M., K.B., P.H., J.H., M.N., J.F.); Institute of Pathology Länggasse, Bern, Switzerland (M.v.G.); and Experimental MRI Laboratory, Department of Neurology, Helsinki University Central Hospital and Institute of Biomedicine, University of Helsinki, Helsinki, Finland (U.A.-R.).