1. From the Departments of Neurology (R.-J.K., E.H., D.S., A.M., S.M., T.T., J.P.), Neurosurgery (J.S., M.N.), and Medical Imaging Center (H.S., O.S.), Helsinki University Central Hospital, Helsinki, Finland; and Departments of Medicine and Florey, University of Melbourne, Melbourne, Victoria, Australia (A.M.).