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Korea Institute for Health and Social Affairs, 2020-10-14, Research in Brief, no. 70, pp. 1 - 10
Korea Institute for Health and Social Affairs, 2022-04-08, Research in Brief, vol. 95, pp. 1 - 9
Korea Institute for Health and Social Affairs, 2023-09-08, Research in Brief, vol. 114, pp. 1 - 10
