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Barry E, Greenhalgh T.Barry E, et al. Among authors: greenhalgh t.BJGP Open. 2022 Aug 30;6(2):BJGPO.2021.0166. doi: 10.3399/BJGPO.2021.0166. Print 2022 Jun.BJGP Open. 2022.PMID: 35523431Free PMC article.