1. Department of Neurology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
2. Division of Neuroradiology, Department of Radiology, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
3. Department of Neurosurgery, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, PA, USA
4. Department of Neurology, New York University Medical Center, NY, USA