1. Division of Cardiology, Pulmonology and Vascular Medicine; Heinrich Heine University Medical Center Dusseldorf; Dusseldorf Germany
2. Institute of Pathophysiology; West German Heart and Vascular Center; University Hospital Essen; University of Duisburg-Essen; Essen Germany
3. Institute for Pharmacology and Clinical Pharmacology; Heinrich Heine University; Dusseldorf Germany