1. Regional Office for Public Health in Castilla y León, Spain
2. Epidemiology office in Palencia, Castilla y León, Spain
3. Epidemiology office in Zamora, Castilla y León, Spain
4. Epidemiology office in León, Castilla y León, Spain
5. Epidemiology office in Valladolid, Castilla y León, Spain
6. Epidemiology office in Burgos, Castilla y León, Spain
7. Epidemiology office in Salamanca, Castilla y León, Spain