1. CIBER Epidemiología y Salud Pública (CIBERESP), Instituto de Salud Carlos III, Madrid, Spain
2. Department of Medicine, Public Health Unit. University of Barcelona, Barcelona, Spain
3. Public Health Agency of Catalonia, Barcelona, Spain
4. Epidemiology Unit, Corporació Sanitària i Universitaria Parc Taulí, Sabadell, Spain
5. Preventive Medicine and Public Health Department, University Hospital Virgen del Rocio, Seville, Spain
6. Preventive Medicine and Public Health Department, University Hospital of Valme, Seville, Spain