1. Gerodontology Research Group (GIOG) and Caridology Unit, Department of Oral Rehabilitation; University of Talca; Talca Chile
2. Interdisciplinary Excellence Research Program on Healthy Aging (PIEI-ES); University of Talca; Talca Chile
3. Institute of Mathematics and Physics; University of Talca; Talca Chile
4. Department of Preventive and Social Dentistry, Faculty of Dentistry; Federal University of Rio Grande do Sul; Porto Alegre Brazil