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 |