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Korea Institute for Health and Social Affairs, 2022-08-18, Research in Brief, vol. 101, pp. 1 - 8
Korea Institute for Health and Social Affairs, 2023-05-25, Research in Brief, vol. 110, pp. 1 - 9
Korea Institute for Health and Social Affairs, 2023-05-02, Research in Brief, no. 109, pp. 1 - 9