1. Centre for Epidemiological Studies on STI and AIDS of Catalonia (CEEISCAT); Public Health Agency of Catalonia (APSCAT); Generalitat de Catalunya; Spain
2. CIBER for Epidemiology and Public Health (CIBERESP); Spain
3. Germans Trias i Pujol Health Sciences Research Institute (IGTP); Spain
4. Autonomous University of Barcelona (UAB); Centre for Demographic Studies (CED); Spain