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