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Hirst A, Hyer RN, Janssen RS.Hirst A, et al. Among authors: hyer rn.Vaccine. 2021 Jul 30;39(33):4733-4741. doi: 10.1016/j.vaccine.2021.05.020. Epub 2021 May 21.Vaccine. 2021.PMID: 34030898Free article.