1. Gastrointestinal Laboratory, Department of Small Animal Clinical SciencesTexas A&M University College Station Texas
2. Department of Veterinary Clinical Sciences, College of Veterinary MedicineIowa State University Ames Iowa
3. Evidensia Specialist Animal Hospital Helsingborg Sweden
4. Helsinki University Helsinki Finland
5. Clinical Sciences DepartmentColorado State University Fort Collins Colorado
6. Veterinary Specialty Hospital San Diego California