1. Statistics Korea. Life expectancy and disability adjusted life expectancy [Internet] 2018.Statistics Korea. Daejeon cited 2018 Nov 10
2. Korea Institute for Health and Social Affairs. 2014 survey of the elderly. Sejong: Korea Institute for Health and Social Affairs; 2014 December. Report No. 2014-61.
3. Disease Statistics. Healthcare Bigdata Hub [Internet] 2010.Healthcare Insurance Review & Assessment Service. Wonju cited 2018 Nov 10
4. Association between clinical and subjective indicators of oral health status in an older adult population
5. Cushing AM, Sheiham A, Maizels J. Developing sociodental indicators-the social impact of dental disease. Community Dent Health 1986;3:3-17.