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Korea Institute for Health and Social Affairs, 2022-10-28, Research in Brief, vol. 104, pp. 1 - 10
Korea Institute for Health and Social Affairs, 2023-07-11, Research in Brief, vol. 112, pp. 1 - 8
Korea Institute for Health and Social Affairs, 2023-06-21, Research in Brief, vol. 111, pp. 1 - 9