1. School of Veterinary Medicine, College of Health and Agricultural SciencesUniversity College Dublin, DublinBelfieldDublin 4Ireland
2. Servicio de Medicina PreventivaInstituto de Investigación Sanitaria (IsDSSS), Hospital Clínico San CarlosCalle del Prof. Martín LagosMadrid28040Spain
3. Hospital Veterinario PucholCalle Sauceda 8Madrid28050Spain
4. Hospital Clínico VeterinarioUniversidad Alfonso X el SabioAvenida de la Universidad, 1Madrid28691Spain