1. 1Goethe University Frankfurt’s University Hospital, Department of Internal Medicine 4, Nephrology (T.S., S.R.P., M.G., T.S., M.W.)
2. University Hospital, Department of Medicine, Cardiology (S.C., D.M.L.)
3. German Center for Cardiovascular Research DZHK, Berlin, Germany (S.C., D.M.L., S.D., A.M.Z.).
4. Else Kroener-Fresenius Center for Nephrological Research (T.S., S.R.P., M.G., T.S., M.W.)
5. Institute for Cardiovascular Regeneration (T.R., S.D., A.M.Z.), Germany.
6. Hôpital Robert Schumann, Hôpital Kirchberg, Luxembourg City, Luxembourg (S.Z.).
7. Saarland University, Department of Internal Medicine 4, Homburg/Saar, Germany (D.F., G.H.H., S.Z.).
8. University of Wuerzburg, University Hospital, Department of Clinical Research and Epidemiology, Comprehensive Heart Failure Center, Germany (C.W.).
9. University of Heidelberg, University Medical Center, Medical Faculty Mannheim, Vth Department of Medicine, Germany (W.M.).
10. Medical University of Graz, Clinical Institute of Medical and Chemical Laboratory Diagnostics, Austria (W.M.).
11. SYNLAB Holding Deutschland GmbH, SYNLAB Academy, Mannheim, Germany (W.M.).