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Korea Institute for Health and Social Affairs, 2018-05, Research in Brief, no. 30, pp. 1 - 7
Korea Institute for Health and Social Affairs, 2021-07-08, Research in Brief, no. 79, pp. 1 - 6
Korea Institute for Health and Social Affairs, 2023-03-17, Research in Brief, vol. 107, pp. 1 - 9