1. Department of Neurosurgery and Spine Surgery (B.C., D.S., S.R., A.H., L.R., A.S., Y.Z., R.J., K.H.W., U.S., P.D.), University Hospital Essen, University of Duisburg-Essen, Germany.
2. Institute of Diagnostic and Interventional Radiology and Neuroradiology (Y.L.), University Hospital Essen, University of Duisburg-Essen, Germany.
3. Institute for Medical Informatics, Biometry and Epidemiology (B.S.), University Hospital Essen, University of Duisburg-Essen, Germany.
4. Department of Neurology (C.K.), University Hospital Essen, University of Duisburg-Essen, Germany.