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Fig. 2. Trend of changes in the estimated prevalence of major oral diseases across nationwide oral health examinations during 2012–2017. The stratified and extracted samples consisted of students in the first grade (elementary school), fourth grade (elementary school), seventh grade (middle school), and tenth grade (high school). Source of origin: annual reports of national students health examination results from 2012 to 2017.20
Korean J Orthod 2020;50:197~205 https://doi.org/10.4041/kjod.2020.50.3.197
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