1. Texas A&M University, College of Veterinary Medicine and Biomedical Sciences Gastrointestinal Laboratory College Station Texas USA
2. Small Animal Clinic University of Thessaly Karditsa Greece
3. Department of Medicine University of Thessaly Karditsa Greece
4. Department of Physiology and Pharmacology University of Georgia Athens Georgia USA
5. Small Animal Sciences GI Laboratory College Station Texas USA
6. VSCS GI Lab College Station Texas USA