Stephan Rosenkranz1, Daniel Dumitrescu2. 1. Klinik III für Innere Medizin, University of Cologne Heart Center, Cologne, Germany; Center for Molecular Medicine Cologne (CMMC), University of Cologne, Cologne, Germany; Cologne Cardiovascular Research Center (CCRC), University of Cologne Heart Center, Cologne, Germany. Electronic address: stephan.rosenkranz@uk-koeln.de. 2. Klinik III für Innere Medizin, University of Cologne Heart Center, Cologne, Germany.