1 From the Department of Neurology (L.A.H.), University of Oklahoma Health Sciences Center, Oklahoma City; and Department of Neurology (D.J.I.), University of Pennsylvania Perelman School of Medicine, Philadelphia. linda-hershey@ouhsc.edu.
2 From the Department of Neurology (L.A.H.), University of Oklahoma Health Sciences Center, Oklahoma City; and Department of Neurology (D.J.I.), University of Pennsylvania Perelman School of Medicine, Philadelphia.