1. Veterinary Pathology and Prairie Diagnostic Services Inc., Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada (Allen)
2. Department of Veterinary Population Medicine and Veterinary Diagnostic Laboratory, College of Veterinary Medicine, University of Minnesota, St. Paul, MN (Goupil)
3. Department of Biomedical Sciences and Veterinary Diagnostic Laboratory, College of Veterinary Medicine, Oregon State University, Corvallis, OR (Valentine)