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Manila, Philippines: WHO Regional Office for the Western Pacific; 2015."},{"key":"2","doi-asserted-by":"crossref","unstructured":"2. Wamala S, Merlo J, Bostr\u00f6m G. Inequity in access to dental care services explains current socioeconomic disparities in oral health: the Swedish National Surveys of Public Health 2004\u20132005. <i>J Epidemiol Community Health<\/i>. 2006;60:1027\u20131033.","DOI":"10.1136\/jech.2006.046896"},{"key":"3","doi-asserted-by":"crossref","unstructured":"3. Molarius A, Engstr\u00f6m S, Flink H, Simonsson B, Tegelberg A. Socioeconomic differences in self-rated oral health and dental care utilisation after the dental care reform in 2008 in Sweden. <i>BMC Oral Health<\/i>. 2014;14:134.","DOI":"10.1186\/1472-6831-14-134"},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Vikum E, Krokstad S, Holst D, Westin S. Socioeconomic inequalities in dental services utilisation in a Norwegian county: the third Nord-Tr\u00f8ndelag Health Survey. <i>Scand J Public Health<\/i>. 2012;40:648\u2013655.","DOI":"10.1177\/1403494812458989"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5. Park HJ, Lee JH, Park S, Kim TI. Trends in the utilization of dental outpatient services affected by the expansion of health care benefits in South Korea to include scaling: a 6-year interrupted time-series study. <i>J Periodontal Implant Sci<\/i>. 2018;48:3\u201311.","DOI":"10.5051\/jpis.2018.48.1.3"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6. Jang YE, Kim CB, Kim NH. Utilization of preventive dental services before and after health insurance covered dental scaling in Korea: 2009 to 2014 Community Health Survey. <i>Asia Pac J Public Health<\/i>. 2017;29:70\u201380.","DOI":"10.1177\/1010539516684944"},{"key":"7","doi-asserted-by":"crossref","unstructured":"7. Jang YE, Kim CB, Kim NH. Influence of dental insurance coverage on access to preventive periodontal care in middle-aged and elderly populations: analysis of representative Korean Community Health Survey Data (2011\u20132015). <i>Int Dent J<\/i>. 2019;69(6):445\u2013453.","DOI":"10.1111\/idj.12488"},{"key":"8","unstructured":"8. Choi JS, Park DY. The impact of national health insurance coverage on pit and fissure sealing experience. <i>Rural Remote Health<\/i>. 2018;18:4804."},{"key":"9","doi-asserted-by":"crossref","unstructured":"9. Jang YE, Lee MY, Park SK, et\u00a0al. A 7-year study of the regional distribution of differences in scaling experience rate among Koreans. <i>J Korean Acad Oral Health<\/i>. 2015;39:201\u2013206.","DOI":"10.11149\/jkaoh.2015.39.3.201"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10. Shaw M, Dorling D, Gordon D, Smith D, Raphael D. <i>The widening gap: health inequalities and policy in Britain<\/i>. 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Measuring socioeconomic inequality in health, health care and health financing by means of rank-dependent indices: a recipe for good practice. <i>J Health Econ<\/i>. 2011;30:685\u2013694.","DOI":"10.1016\/j.jhealeco.2011.04.004"},{"key":"18","doi-asserted-by":"crossref","unstructured":"18. Chiou ST, Wu CY, Hurng BS, Lu TH. Changes in the magnitude of social inequality in the uptake of cervical cancer screening in Taiwan, a country implementing a population-based organized screening program. <i>Int J Equity Health<\/i>. 2014;13:4.","DOI":"10.1186\/1475-9276-13-4"},{"key":"19","doi-asserted-by":"crossref","unstructured":"19. Donaldson AN, Everitt B, Newton T, Steele J, Sherriff M, Bower E. The effects of social class and dental attendance on oral health. <i>J Dent Res<\/i>. 2008;87:60\u201364.","DOI":"10.1177\/154405910808700110"},{"key":"20","doi-asserted-by":"crossref","unstructured":"20. Hiyoshi A, Fukuda Y, Shipley MJ, Brunner EJ. 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