1. Institute for Prevention and Occupational Medicine of the German Social Accident Insurance (IPA), Institute of the Ruhr University Bochum, Germany
2. Institute for Medical Informatics, Biometry and Epidemiology, University Duisburg-Essen, Essen, Germany
3. Department of Computer Science, University of Applied Sciences and Arts Dortmund, Dortmund, Germany
4. Medical Faculty, Institute for Medical Sociology, University of Düsseldorf, Düsseldorf, Germany
5. SHIP/KEF, Institute for Community Medicine, University Medicine Greifswald, Greifswald, Germany
6. Department of Medicine A, University Medicine Greifswald, Greifswald, Germany