1. National Heart, Lung, and Blood Institute's Framingham Heart Study Framingham Massachusetts USA
2. Sections of Cardiovascular Medicine and Preventive Medicine, Boston Medical Center Boston University School of Medicine Boston Massachusetts USA
3. LIFE – Leipzig Research Center of Civilization Diseases Leipzig University Leipzig Germany
4. Institute for Medical Informatics, Statistics and Epidemiology Leipzig University Leipzig Germany
5. Department of Electrophysiology Heart Center at University of Leipzig Leipzig Germany
6. Institute of Clinical Chemistry and Laboratory Medicine University Hospital Regensburg Regensburg Germany
7. Department of Internal Medicine/Cardiology Heart Center at University of Leipzig Leipzig Germany