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. 2023 May 13. Online ahead of print. doi: 10.1016/j.jaad.2023.05.017

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Fig 1 — Flow chart of study population selection. A total of 3,838,120 individuals who received mRNA-based COVID-19 vaccination and 3,834,804 individuals in the historical control cohort were selected from the Korean Disease Control and Prevention Agency-COVID-19-National Health Insurance Service cohort. COVID-19, Coronavirus disease 2019.