1. 1 Department of Small Animal Clinical Science, Institute of Infection, Veterinary and Ecological Science, University of Liverpool, Neston, Liverpool, UK
2. 2 Centro Veterinario Dott.ri Pisani-Carli-Chiodo, Luni, La Spezia, Italy
3. 3 Department of Veterinary Sciences, University of Pisa, San Piero a Grado, Pisa, Italy