S. Chindavijak, N. Tanamai, S. Kaewsiri, and K. Kaewjinda, “Prevalence Trend of Chronic Otitis Media in Provincial Hospitals under Ministry of Public Health and Complications in Tertiary Hospitals Each Year from 2014-2018”, J DMS, vol. 46, no. 2, pp. 61–69, Sep. 2021.