1. Faculty of Veterinary Medicine; University of Teramo; Teramo Italy
2. Faculty of Political Sciences; University of Teramo; Teramo Italy
3. Department of Veterinary Medical Sciences; University of Bologna; Ozzano dell'Emilia (Bologna) Italy
4. Department of Biopathological Sciences and Hygiene of Animal and Food Production, Faculty of Veterinary Medicine; University of Perugia; Perugia Italy