1. Department of Veterinary Clinics; Faculty of Veterinary Medicine; San Piero a Grado Pisa Italy
2. Department of Veterinary Animal Pathology; Faculty of Veterinary Medicine; Pisa Italy
3. Institute of Comparative Medicine, Division of Small Animal Clinical Sciences; School of Veterinary Medicine, College of Medicine, Veterinary Medicine & Life Sciences, University of Glasgow; Bearsden Glasgow G61 1QH