1. Department of Veterinary Clinical Sciences; University of Minnesota; 1365 Gortner Avenue Saint Paul MN 55018 USA
2. Department of Veterinary Clinical Sciences; The Ohio State University; 601 Vernon Tharp Street Columbus OH 43210 USA
3. Centre Vétérinaire Laval; 4530 Highway 440 Laval Quebec Canada H7T 2P7
4. Department of Veterinary and Biomedical Sciences; University of Minnesota; 1365 Gortner Avenue Saint Paul MN 55018 USA