1. Department of Animal and Food Science, University of Wisconsin–River Falls, River Falls, WI 54022, USA
2. Department of Veterinary Population Medicine, College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108, USA
3. Department of Animal and Dairy Sciences, University of Wisconsin–Madison, Madison, WI 53706, USA
4. Veterinary and Consumer Affairs, Merck Animal Health, Madison, NJ 07930, USA
5. Department of Large Animal Clinical Sciences, College of Veterinary Medicine, Michigan State University–East Lansing, East Lansing, MI 48824, USA
6. Abbyland Pork Pack, Curtiss, WI 54422, USA
7. Merck Animal Health, Lenexa, KS 66219, USA
8. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
9. Department of Veterinary and Biomedical Sciences, College of Veterinary Medicine, University of Minnesota, St. Paul, MN 55108, USA