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Korea Institute for Health and Social Affairs, 2019, Research in Brief, no. 42, pp. 1 - 6
Korea Institute for Health and Social Affairs, 2022-01-07, Research in Brief, vol. 89, pp. 1 - 10
한국보건사회연구원, 2018-01, Research in Brief, no. 26, pp. 1 - 6
