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Khan M, Boyce A, Prieto-Merino D, Svensson Å, Wedgeworth E, Flohr C.Khan M, et al.Acta Derm Venereol. 2017 Nov 15;97(10):1167-1171. doi: 10.2340/00015555-2681.Acta Derm Venereol. 2017.PMID: 28421234Free article.Review.