1. School of Veterinary Medicine and Animal Science, Sao Paulo State University Botucatu Sao Paulo Brazil
2. Department of Clinical StudiesOntario Veterinary College, University of Guelph Ontario Canada
3. Department of PathobiologyOntario Veterinary College, University of Guelph Ontario Canada
4. School of Engineering, College of Engineering and Physical Sciences, University of Guelph Ontario Canada
5. Department of Biomedical SciencesOntario Veterinary College, University of Guelph Ontario Canada