1. Department of Veterinary Medicine and Animal Production, University of Napoli Federico II, via F. Delpino 1, 80137 Napoli, Italy.
2. School of Biosciences and Veterinary Medicine, University of Camerino, viale Circonvallazione 93/95, 62024 Matelica (MC), Italy.
3. Department of Agriculture, Food, Environment and Forestry, University of Firenze, via delle Cascine 5, 50144 Firenze, Italy.