1. Department of Cardiology; University Hospital Essen; Essen Germany
2. Department of Neurology; University Hospital Essen; Essen Germany
3. Institute for Medical Informatics Biometry and Epidemiology; University Duisburg-Essen; Essen Germany
4. Institute of Epidemiology and Social Medicine; University of Münster; Essen Germany
5. Department of Clinical Chemistry; University Hospital Essen; Essen Germany
6. Department of Cardiology; Hospital Bethanien Moers; Moers Germany