From the Department of Neurology (R.M.D., H.P.A.), McGaw Medical Center of Northwestern University, Chicago, IL; Department of Neurology (R.M.E.S., C.E.G., R.E.S., D.R.S.), Johns Hopkins School of Medicine, Baltimore, MD; Rush Medical College at Rush University (A.N.), Chicago, IL; Hospital Dr. Sótero del Rio (I.E.), Red Salud UC Christus, Clinica Las Condes, Santiago, Chile; University Teaching Hospital (K.C.K., D.R.S.), Lusaka, Zambia; Department of Neurology, Wake Forest School of Medicine (R.E.S.), Winston-Salem, NC; and Department of Internal Medicine (S.T.), Johns Hopkins Bayview Medical Center, Baltimore, MD.