1. Department of Pharmacology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
2. Département de Biomédicine Vétérinaire, Université de Montreal, C.P. 500, Saint-Hyacinthe, Quebec J2S 7C6, Canada.
3. Department of Large Animal Clinical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.