1. Department of Cardiac Sciences, University of Calgary and Libin Cardiovascular Institute, Alberta, Canada (A.M.G.).
2. Institute of Pharmacology, West German Heart and Vascular Center, University Duisburg-Essen, Germany (D.D.).
3. Department of Medicine, Montreal Heart Institute and Université de Montréal, Montréal, Canada (D.D.).
4. Department of Molecular Physiology & Biophysics, Baylor College of Medicine, Houston, TX (D.D.).