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Korea Institute for Health and Social Affairs, 2020-05-25, Research in Brief, no. 55, pp. 1 - 4
Korea Institute for Health and Social Affairs, 2021-11-03, Research in Brief, vol. 85, pp. 1 - 5
Korea Institute for Health and Social Affairs, 2024-03-21, Research in Brief, vol. 118, pp. 1 - 7
