1 Department of Nephrology and Hypertension, Universitätsklinikum Erlangen, University of Erlangen-Nürnberg, Erlangen, Germany. Electronic address: christian.schmidt-lauber@uk-erlangen.de.
2 Department of Cardiology, Universitätsklinikum Erlangen, University of Erlangen-Nürnberg, Erlangen, Germany.
3 Department of Nephrology and Hypertension, Universitätsklinikum Erlangen, University of Erlangen-Nürnberg, Erlangen, Germany.