1. Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
2. Institute for Medical Informatics, Biometry, and Epidemiology, and
3. West German Heart Centre of Essen, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
4. Rhenish Institute for Environmental Research, University of Cologne, Cologne, Germany
5. Medical School, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany