1. Gastrointestinal Laboratory, School of Veterinary Medicine and Biomedical Sciences, Texas A&M University, College Station, TX 77840, USA
2. Department of Equine and Small Animal Medicine, Faculty of Veterinary Medicine, Helsinki University, 00014 Helsinki, Finland
3. Evidensia Specialist Animal Hospital, 25466 Helsingborg, Sweden
4. Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Iowa State University, Ames, IA 50011, USA
5. Carlson College of Veterinary Medicine, Oregon State University, Corvallis, OR 97331, USA
6. Department of Animal Sciences, University of Illinois at Urbana-Champaign, Urbana, IL 61820, USA
7. Department of Small Animal Medicine and Surgery, University of Veterinary Medicine, 30545 Hannover, Germany
8. Clinic of Small Animal Medicine, Ludwig-Maximilians University, 80539 Munich, Germany
9. Clinic for Small Animal Internal Medicine, Vetsuisse Faculty, 8057 Zurich, Switzerland
10. Small Animal Clinic of Veterinary Faculty Ljubljana, University of Ljubljana, 1000 Ljubljana, Slovenia
11. Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Louisiana State University, Baton Rouge, LA 70803, USA