1. Department of Cardiology; Medical University of Graz; Graz Austria
2. National Heart, Lung, and Blood Institute's Framingham Heart Study; Framingham MA USA
3. Department of Mathematics and Statistics; Boston University; Boston MA USA
4. Department of Biostatistics; Boston University School of Public Health; Boston MA USA
5. Institute for Clinical Evaluative Sciences and Toronto General Hospital; University of Toronto; Toronto Canada
6. Center for Population Studies; National Heart, Lung, and Blood Institute; Bethesda MD USA
7. Cardiology and Preventive Medicine and Epidemiology Sections, Department of Medicine; Boston University School of Medicine; Boston MA USA