1 Department of Neurology, Washington University School of Medicine, St. Louis, MO, and Department of Neurosurgery, Washington University School of Medicine, St. Louis, MO; Department of Neurology, Washington University School of Medicine, St. Louis, MO; Department of Neurology, Washington University School of Medicine, St. Louis, MO, and Department of Radiology, Washington University School of Medicine, St. Louis, MO.