1. The Institute of Cardiovascular Sciences, St Boniface Hospital Albrechtsen Research Centre, Department of Physiology and Pathophysiology, Rady College of Medicine, Max Rady Faculty of Health Sciences, University of Manitoba, Canada (I.R.-N., B.L., L.A.K.).
2. Centre for Cardiovascular Investigations, Biomedical Sciences/Ontario Veterinary College, University of Guelph, Canada (T.A.M.).