1. Division of Research Kaiser Permanente Northern California Oakland CA USA
2. Vitalant Research Institute San Francisco CA USA
3. University of California San Francisco CA USA
4. University of British Columbia Victoria BC Canada
5. National Heart, Lung, and Blood Institute National Institutes of Health Bethesda MD USA
6. Clinical Epidemiology Division Department of Medicine Solna Karolinska Institutet Stockholm Sweden
7. Department of Cardiology Södersjukhuset Stockholm Sweden