1 From the Departments of Neurology, Neurosurgery, and Epidemiology (E.C.L.), University of Iowa, Iowa City; and Departments of Neurology and Neurosurgery (J.G.L.), Upstate Medical University, Syracuse, NY. enrique-leira@uiowa.edu.
2 From the Departments of Neurology, Neurosurgery, and Epidemiology (E.C.L.), University of Iowa, Iowa City; and Departments of Neurology and Neurosurgery (J.G.L.), Upstate Medical University, Syracuse, NY.