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Korea Institute for Health and Social Affairs, 2020-09-07, Research in Brief, no. 62, pp. 1 - 7
Korea Institute for Health and Social Affairs, 2021-04-28, Research in Brief, no. 75, pp. 1 - 7
Korea Institute for Health and Social Affairs, 2021-10-06, Research in Brief, vol. 83, pp. 1 - 9
