Affiliation: | 1. Department of Companion Animal Clinical Sciences, Norwegian School of Veterinary Science, , Oslo, Norway;2. Department of Basic Sciences and Aquatic Medicine, Norwegian School of Veterinary Science, , Oslo, Norway;3. Department of Pathobiology, University of Pennsylvania School of Veterinary Medicine, , Philadelphia, PA;4. Department of Clinical studies, Veterinary hospital of the University of Pennsylvania, , Philadelphia, PA |