1. Interdisciplinary Center for Health Studies, Faculty of Dentistry University of Valparaíso Valparaíso Chile
2. Interuniversity Center for Healthy Aging Chile
3. Department of Oral Pathology and Medicine, Faculty of Dentistry University of Chile Santiago Chile
4. Center for Epidemiology and Surveillance of Oral Diseases (CESOD) Santiago Chile
5. Department of Sociology, Faculty of Social Sciences University of Chile Santiago Chile
6. Department of Oral Health, Division of Prevention and Control of Diseases, Ministry of Health Santiago Chile
7. Department of Conservative Dentistry, Faculty of Dentistry University of Chile Santiago Chile