1. Department of General Practice, Institute for Community Medicine University Medicine Greifswald Greifswald Germany
2. DRK Hospital Grimmen GmbH Süderholz Germany
3. Nephrology, Dialysis and Hypertension, Internal Medicine A University Medicine Greifswald Greifswald Germany
4. KfH Kidney Center Greifswald University Medicine Greifswald Germany
5. Faculty of Applied Health Sciences European University of Applied Sciences Rostock Germany