1. Department of Internal Medicine A, University Medicine Greifswald , Greifswald, Germany
2. Institute for Community Medicine, University Medicine Greifswald , Greifswald, Germany
3. Department of Internal Medicine B, University Medicine Greifswald , Greifswald, Germany
4. Institute of Clinical Chemistry and Laboratory Medicine, University Medicine Greifswald , Greifswald, Germany
5. Department of Neurology, University Medicine Greifswald , Greifswald, Germany