1. Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, College Station , TX 77843 , USA
2. Department of Animal Sciences, University of Florida , Gainesville, FL 32611 , USA
3. Department of Large Animal Clinical Sciences, College of Veterinary Medicine, University of Florida , Gainesville, FL 32611 , USA
4. Department of Veterinary Preventative Medicine, College of Veterinary Medicine, The Ohio State University , Columbus, OH 43210 , USA
5. Department of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University , Ithaca, NY 14850 , USA
6. Department of Clinical Sciences, School of Veterinary Medicine, Ross University , St. Kitts, West Indies, KN
7. Department of Animal Sciences, University of Illinois at Urbana-Champaign , Urbana-Champaign, IL 61801 , USA
8. Department of Animal Sciences, University of Wisconsin , Madison, WI 53706 , USA
9. Department of Animal Sciences, Colorado State University , Fort Collins, CO 80521 , USA