1. Department of Veterinary Sciences, University of Messina, Via Palatucci Annunziata, 98168 Messina, Italy
2. Department of Catania, Experimental Zooprophylactic Institute of Sicily, Via Passo Gravina 195, 95125 Catania, Italy
3. Department of Animal Medicine and Surgery, Faculty of Veterinary Medicine, CEU-Cardenal Herrera University, Tirant lo Blanc 7, Alfara del Patriarca, 46115 Valencia, Spain
4. Department of Clinical and Experimental Medicine, Policlinico Universitario, University of Messina, Via Consolare Valeria 1, 98125 Messina, Italy