1. Department of Health, Generalitat of Catalonia, Barcelona, Spain
2. CIBER Epidemiology and Public Health, Madrid, Spain
3. IRBLleida, University of Lleida, Lleida, Spain
4. Public Health Institute of Navarra, IdiSNA, Pamplona, Spain
5. University of Barcelona, Barcelona, Spain
6. Surveillance Service, Andalusian Government, Seville, Spain
7. University of Leon, Leon, Spain
8. Area of Epidemiology, Community of Madrid, Madrid, Spain
9. Hospital de Galdakao, Unansolo, Spain
10. University of Valencia, Valencia, Spain