1. Research Center; Montreal Heart Institute; Montreal Canada
2. Department of Physiology; Université de Montréal; Montreal Canada
3. Department of Medicine; Université de Montréal; Montreal Canada
4. Department of Medicine; McGill University; Montreal Canada
5. Department of Pharmacology and Therapeutics; McGill University; Montreal Canada
6. Institute of Pharmacology; West German Heart and Vascular Center, Faculty of Medicine, University Duisburg-Essen; Essen Germany