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Korea Institute for Health and Social Affairs, 2019, Research in Brief, no. 44, pp. 1 - 9
Korea Institute for Health and Social Affairs, 2020-05-18, Research in Brief, no. 54, pp. 1 - 8
한국보건사회연구원, 2016-04-30, Research in Brief, no. 15, pp. 6 - 11
