1. VISAVET Health Surveillance Centre, Universidad Complutense; Madrid Spain
2. Departamento de Medicina y Cirugía Animal; Facultad de Veterinaria; Universidad Complutense; Madrid Spain
3. National Institute for Public Health and the Environment (RIVM), Centre for Infectious Disease Control (CIb); Bilthoven The Netherlands
4. Centre for Preventive Medicine, Animal Health Trust; Lanwades Park, Kentford Newmarket Suffolk UK
5. Departamento de Sanidad Animal; Facultad de Veterinaria; Universidad Complutense; Madrid Spain