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Johnston S, Wong ST, Blackman S, Chau LW, Grool AM, Hogg W.Johnston S, et al.Prim Health Care Res Dev. 2018 Jul;19(4):416-420. doi: 10.1017/S1463423617000718. Epub 2017 Nov 16.Prim Health Care Res Dev. 2018.PMID: 29141700Free PMC article.