1. Public Health Research Group Department of Community Nursing, Preventive Medicine and Public Health and History of Science University of Alicante Alicante Spain
2. Faculty of Nursing and Physiotherapy University of Lleida Lleida Spain
3. Research Group in Society, Health, Education and Culture (GESEC) University of Lleida Lleida Spain
4. Health Care Research Group (GRECS) Biomedical Research Institute (IRB) Lleida Spain
5. Department of Nursing Faculty of Medicine Universidad Autónoma de Madrid Madrid Spain
6. CIBER of Epidemiology and Public Health (CIBERESP) Madrid Spain
7. Department of Epidemiology and Global Health Unversity of Umeå Umeå Sweden