1. Johns Hopkins Ciccarone Center for the Prevention of Heart Disease, Baltimore, MD
2. Department of Medicine, University of Kansas School of Medicine, Wichita, KS
3. School of Medicine, University of Louisville, KY
4. Center for Clinical and Epidemiologic Research, University of São Paulo, Brazil
5. Postgraduate Studies Program and Hospital de Clínicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
6. School of Medicine, University of São Paulo, Brazil