1. Dipartimento di Scienze Mediche Veterinarie, University of Bologna, Ozzano Emilia (BO), Italy
2. Veterinario libero professionista, Castel del Rio (BO), Italy
3. Dipartimento di Scienze Sperimentali Veterinarie, University of Padova, Legnaro (PD), Italy
4. Department of Animal Health, University of Parma, Parma (PR), Italy