1. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
2. USDA-ARS, Ames, Iowa, USA
3. Department of Small Animal Clinical Sciences, Gastrointestinal Laboratory, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX, USA
4. School of Biosciences and Veterinary Medicine, University of Camerino, Camerino, Macerata, Italy
5. Department of Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA
6. Department of Genetics, Development & Cell Biology, College of Liberal Arts and Sciences, Iowa State University, Ames, Iowa, USA
7. Colorado State University Veterinary Teaching Hospital, Fort Collins, CO, USA
8. Veterinary Specialty Hospital – San Diego, CA, USA
9. Department of Veterinary Pathology, College of Veterinary Medicine, Iowa State University, Ames, Iowa, USA