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Korea Institute for Health and Social Affairs, 2022-10-11, Research in Brief, vol. 103, pp. 1 - 11
Korea Institute for Health and Social Affairs, 2022-12-08, Research in Brief, vol. 105, pp. 1 - 13
Korea Institute for Health and Social Affairs, 2024-01-10, Research in Brief, vol. 117, pp. 1 - 10