1. Department of Animal Pathology, University of Zaragoza, 50013 Zaragoza, Spain
2. Department of Anatomy, Embriology and Animal Genetics, Faculty of Veterinary Sciences, University of Zaragoza, 50013 Zaragoza, Spain
3. Agroalimentary Institute of Aragon-IA2, Department of Animal Pathology, Universidad de Zaragoza-CITA, 50009 Zaragoza, Spain
4. Ceva Salud Animal, 08028 Barcelona, Spain