1. Department of Internal Medicine, Division of Endocrinology and Diabetology, Medical University of Graz, 8036 Graz, Austria
2. University Institute for Medical and Chemical Laboratory Diagnostics, Paracelsus Medical University, 5020 Salzburg, Austria
3. Department of Geriatrics and Aging Research, University Hospital Zurich and University of Zurich, 8091 Zurich, Switzerland
4. Department of Cardiology, Medical University of Graz, 8036 Graz, Austria
5. Department of Internal Medicine, Division of Nephrology, Medical University of Graz, 8036 Graz, Austria
6. Clinical Institute of Medical and Chemical Laboratory Diagnostics Medical, University of Graz, 8036 Graz, Austria
7. Institute for Physiology, Johannes Kepler University Linz, 4040 Linz, Austria
8. Departments of Nephrology and Medical Intensive Care and Internal Medicine and Cardiology, Charité University Medicine, Campus Virchow-Klinikum, 10117 Berlin, Germany
9. DZHK (German Centre for Cardiovascular Research), partner site Berlin, 10785 Berlin, Germany
10. Synlab Academy, 68159 Mannheim, Germany
11. Medical Clinic V (Nephrology, Hypertensiology, Rheumatology, Endocrinology, Diabetology), Medical Faculty Mannheim, University of Heidelberg, 68167 Mannheim, Germany