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Korea Institute for Health and Social Affairs, 2018-01, Research in Brief, no. 27, pp. 1 - 7
Korea Institute for Health and Social Affairs, 2019-04, Research in Brief, no. 40, pp. 1 - 5
Korea Institute for Health and Social Affairs, 2020-07-29, Research in Brief, no. 61, pp. 1 - 7
한국보건사회연구원, 2015-05-01, Research in Brief, no. 3, pp. 1 - 5