University of Naples Federico II, affiliation not provided to SSRN, University of Naples Federico II, University of Naples Federico II, University of Naples Federico II, affiliation not provided to SSRN, affiliation not provided to SSRN, University of Naples Federico II, University of Naples Federico II, Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise ‘G. Caporale and University of Naples Federico II