1. International Doctoral School Universidad Nacional de Estudios a Distancia (UNED) Madrid Spain
2. Department of Community Nursing, Preventive Medicine and Public Health and the History of Science Universitat d' Alacant, CIBER of Epidemiology and Public Health (CIBERESP) Madrid Spain
3. Department of Nursing Universdad Autónoma de Madrid, CIBER of Epidemiology and Public Health (CIBERESP) Madrid Spain
4. Department of Social Sciences Universidad Carlos III de Madrid Madrid Spain
5. Department of Epidemiology and Biostatistics Institute of Health Carlos III, CIBER of Epidemiology and Public Health (CIBERESP) Madrid Spain