1. Department of Health, Animal Science and Food Safety, University of Milan, Milan, Italy
2. Department of Food and Drug, University of Parma, Parma, Italy
3. Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna ‘B. Ubertini’, Brescia, Italy
4. U.O. Veterinaria, D.G. Welfare, Milano, Italy