1. Small Animal Clinic; College of Veterinary Medicine, University of Leipzig; Leipzig Saxony Germany
2. Gastrointestinal Laboratory; College of Veterinary Medicine and Biomedical Sciences, Texas A&M University; College Station Texas
3. Department of Pathobiology & Diagnostic Investigation; College of Veterinary Medicine, Michigan State University; East Lansing Michigan
4. Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences; Texas A&M University; College Station Texas
5. Institute of Agricultural and Nutritional Sciences, Martin Luther University Halle-Wittenberg; Halle (Saale) Saxony-Anhalt Germany
6. Small Animal Veterinary Teaching Hospital, College of Veterinary Medicine, Purdue University; West Lafayette Indiana
7. Institute of Animal Pathology, Department of Infectious Diseases and Pathobiology; Vetsuisse Faculty Bern, University of Bern; Bern Switzerland
8. Institute of Veterinary Pathology, College of Veterinary Medicine, Freie Universität Berlin; Berlin Germany