1. Department of Neuroradiology (MNE, IEM, SW, MK, GB), Clinical Neuroscience Center, University Hospital Zurich, Switzerland; Department of Neurosurgery (MNE), Faculty of Medicine, Menoufia University; Department of Neurology (IEM), Faculty of Medicine, South valley University, Egypt; Department of Neurology (MK), Clinical Neuroscience Center, University Hospital Zurich, Switzerland; and International Neuroscience Institute (SK, GB), Hannover, Germany.