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Korea Institute for Health and Social Affairs, 2022-02-10, Research in Brief, vol. 91, pp. 1 - 8
한국보건사회연구원, 2015-05-15, Research in Brief, no. 4, pp. 1 - 7
Korea Institute for Health and Social Affairs, 2023-10-20, Research in Brief, vol. 115, pp. 1 - 10
