1. Research Center, Montreal Heart Institute, Montreal, Quebec H1T 1C8, Canada
2. Department of Pharmacology and Physiology, Université de Montréal, Montreal, Quebec H3T 1J4, Canada
3. Institute of Biomedical Engineering, Université de Montréal, Montreal, Quebec H3T 1J4, Canada
4. Department of Physiology, University of Bern, CH-3012 Bern, Switzerland
5. Department of Medinine, Universite de Montreal, Quebec, Canada