1. Department of Comparative Biosciences; University of Illinois-Urbana-Champaign, College of Veterinary Medicine; 2001 S Lincoln Ave Urbana IL 61802 USA
2. Northern Illinois Animal and Bird Hospital; 3202 Northwest Hwy Cary IL 60013 USA
3. Diagnostic Center for Population and Animal Health; College of Veterinary Medicine, Michigan State University; 4125 Beaumont Road Lansing MI 48910-8104 USA