1. Department of Public Health, Comparative Pathology and Veterinary Hygiene, Faculty of Veterinary Medicine; University of Padova; Legnaro PD Italy
2. Department of Animal Pathology, Public Health and Veterinary Hygiene, Faculty of Veterinary Medicine; University of Milano; Milano Italy
3. Department of Animal Pathology, Faculty of Veterinary Medicine; University of Torino; Grugliasco TO Italy
4. Department of Veterinary Science; Faculty of Veterinary Medicine; University of Milano; Milano Italy