1. Division of Cardiology, Department of Medicine Johns Hopkins University Baltimore MD USA
2. National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD USA
3. Ribeirão Preto Medical School University of Sao Paulo Sao Paulo Brazil
4. Division of Research Kaiser Permanente Oakland CA USA
5. School of Medicine University of Alabama at Birmingham Birmingham AL USA
6. School of Public Health University of Minnesota Minneapolis MN USA
7. Feinberg School of Medicine Northwestern University Chicago IL USA
8. Population and Quantitative Health Sciences University of Massachusetts Medical School Worcester MA USA
9. Nemours Cardiac Center Nemours/Alfred I. duPont Hospital for Children Wilmington DE USA