1. Institute for Social Medicine, Epidemiology, and Health Economics, Charité University Medical Center, Berlin
2. Cardiology Practice, Henstedt-Ulzburg
3. Rehabilitation Center for Cardiovascular Diseases, Rüdersdorf
4. Department of Medical Biometry and Epidemiology, University of Hamburg
5. Department of Internal Medicine, University of Hamburg
6. Department of Cardiology, University of Heidelberg, Germany