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Gulbrandsen P, Hofoss D, Nylenna M, Saltyte-Benth J, Aasland OG.Gulbrandsen P, et al.Scand J Prim Health Care. 2007 Mar;25(1):20-6. doi: 10.1080/02813430600879680.Scand J Prim Health Care. 2007.PMID: 17354155Free PMC article.