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Bull ER, Mills M, Byrne-Davis LMT, Hart JK.Bull ER, et al. Among authors: hart jk.Br J Health Psychol. 2021 Feb;26(1):198-213. doi: 10.1111/bjhp.12464. Epub 2020 Aug 13.Br J Health Psychol. 2021.PMID: 32790002Clinical Trial.