1. From the Division of Cardiology, Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Rio Grande do Sul (F.D.F.), Brazil; the Department of Biostatistics (L.E.C.) and the Department of Epidemiology (G.H.), School of Public Health, University of North Carolina, Chapel Hill; School of Public Health and Tropical Medicine, Tulane University Medical Center (P.K.W.), New Orleans, La; and the Department of Epidemiology, The Johns Hopkins University School of Hygiene and...