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Korea Institute for Health and Social Affairs, 2020-05-18, Research in Brief, no. 54, pp. 1 - 8
Korea Institute for Health and Social Affairs, 2021-12-09, Research in Brief, vol. 87, pp. 1 - 11
Korea Institute for Health and Social Affairs, 2022-03-10, Research in Brief, vol. 93, pp. 1 - 9
