1. Zoetis, Av. Europa 20B, Alcobendas, 28108 Madrid, Spain
2. Salud Veterinaria y Zoonosis, Animal Health Department, Faculty of Veterinary Sciences, Complutense University of Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
3. Animal Health Department, Faculty of Veterinary Sciences, University of León, 24071 León, Spain