1. Department of Physiology, University of Saskatchewan College of Medicine, 107 Wiggins Road, Saskatoon, SK, Canada S7N 5E5
2. Department of Neurosciences, Psychology, Drug Research and Child Health Section of Pharmacology and Toxicology, University of Florence, Viale Pieraccini 6, 50139 Florence, Italy
3. The Medical Affairs Company, Cardiovascular, Troy, MI 48085, USA