1. From the Departments of Neurology (S.O.M., A.C.S., L.A.C.), Interventional Neuroradiology (M.B.F.), and Social Medicine (M.B.W.), Federal University of Rio Grande do Sul, and Hospital de Clínicas de Porto Alegre (S.O.M., A.C.S., L.A.C., M.B.W.), Porto Alegre, the Departments of Interventional Neuroradiology (F.M.A., D.B.) and Neurology (F.O.L., J.J.F.C., F.M.C., D.B.), Hospital Geral de Fortaleza, and the Department of Post-Graduate Medical Sciences, University of Fortaleza, Fortaleza (F.M.C.), the...