1. Cornell University Veterinary Specialists Stamford Connecticut USA
2. Gastrointestinal Laboratory College of Veterinary Medicine and Biomedical Sciences, Texas A&M University College Station Texas USA
3. College of Veterinary Medicine University of Minnesota St Paul Minnesota USA
4. Department of Pathology College of Veterinary Medicine, University of Georgia Athens Georgia USA
5. Department of Veterinary Clinical Sciences, School of Veterinary Medicine Louisiana State University Baton Rouge Louisiana USA
6. Flagstaff Veterinary Internal Medicine Consulting Flagstaff Arizona USA
7. Melbourne Veterinary School University of Melbourne Melbourne Victoria Australia
8. Institute of Pathology, School of Medicine and Health Technical University of Munich Munich Germany