1 From the Department of Neurology (K.C.F., E.M.M.), Johns Hopkins School of Medicine; and Department of Epidemiology (K.C.F., E.M.M.), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD.
2 From the Department of Neurology (K.C.F., E.M.M.), Johns Hopkins School of Medicine; and Department of Epidemiology (K.C.F., E.M.M.), Johns Hopkins Bloomberg School of Public Health, Baltimore, MD. emowry1@jhmi.edu.