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.