1. Gastrointestinal Laboratory Department of Small Animal Clinical Sciences College of Veterinary Medicine and Biomedical Sciences Texas A&M University College Station Texas USA
2. Clinic for Swine and Small Ruminants Forensic Medicine and Ambulatory Service University of Veterinary Medicine Hannover Hannover Germany
3. Department for Small Animals Veterinary Teaching Hospital College of Veterinary Medicine University of Leipzig Leipzig SN Germany
4. Small Animal Practice Pommerhof Plaidt RLP Germany
5. Department of Clinical Veterinary Science University of Bristol Langford Bristol UK
6. Veterinary Pathology Group (VPG) Exeter VPG Synlab Group Exeter Devon UK