1. From the Department of Neurosurgery (R.J, T.F.D., M.D.O., D.P., P.D., K.H.W., U.S.), Clinic for Neurology (M.K., C.K.), and Institute for Diagnostic and Interventional Radiology (M.F.), University Hospital of Essen, Germany; and Institute for Medical Biometry and Medical Informatics, University Medical Center Freiburg, Germany (K.K.).