1. Klinik und Poliklinik für Kardiologie, University Hospital Leipzig , Liebigstr. 20, 04103 Leipzig , Germany
2. Department of Internal Medicine (Endocrinology and Nephrology) and Helmholtz Institute for Metabolic, Obesity and Vascular Research (HI-MAG) of the Helmholtz Zentrum München, University of Leipzig and University Hospital Leipzig , Leipzig , Germany
3. Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostic, University Hospital Leipzig , Leipzig , Germany