1. Interdisciplinary Center for Health Studies Faculty of Dentistry University of Valparaíso Valparaíso Chile
2. Faculty of Dentistry Universidad de Chile Santiago Chile
3. Center for Epidemiology and Surveillance of Oral Diseases (CESOD) and Department of Oral Pathology and Medicine Faculty of Dentistry University of Chile Santiago Chile
4. Department of Conservative Dentistry Faculty of Dentistry University of Chile Santiago Chile
5. Faculty of Dentistry University of La Serena La Serena Chile