| Affiliation: | 1. Department of Neurosurgery, University Hospital Tuebingen, Eberhard-Karls-University, Tuebingen, Germany;2. Department of Neurosurgery, Katharinenhospital Stuttgart, Stuttgart, Germany;3. Institute of Anatomy, Eberhard-Karls-University, Tuebingen, Germany;1. Division of Spine Surgery, University of Illinois at Chicago, Chicago, Illinois, USA;2. Department of Neurosurgery, Neurological Institute, Cleveland Clinic, Cleveland, Ohio, USA;1. Department of Radiology, Michigan State University, Radiology Building, 846 Service Road, Room 184, East Lansing, MI 48824, USA;2. Departments of Neurology and Clinical Pharmacology, Stroke Prevention and Atherosclerosis Research Centre, Robarts Research Institute, Western University, 1400 Western Road, London, Ontario N6G 2V4, Canada |
