1. Department of Veterinary Medicine and Animal Productions University of Naples Federico II Naples Italy
2. Istituto Zooprofilattico Sperimentale del Lazio e della Toscana ‘M. Aleandri’ Rome Italy
3. Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta, National Reference Center of Veterinary and Comparative Oncology (CEROVEC) Genoa Italy