1. School of Biosciences and Veterinary Medicine University of Camerino Matelica Italy
2. Department of Life and Environmental Sciences Polytechnic University of Marche Ancona Italy
3. St. Antonio Veterinary Clinic Madignano Italy
4. Gastrointestinal Laboratory Department of Small Animal Clinical Sciences Texas A&M University College Station TX USA
5. Department of Veterinary Clinical Sciences College of Veterinary Medicine Iowa State University Ames IA USA
6. Gastroenterology and Hepatology Section Department of Clinical and Experimental Medicine University of Perugia Perugia Italy