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Larun L, Bjørner T, Fretheim A, Brurberg KG.Larun L, et al.Tidsskr Nor Laegeforen. 2016 Mar 15;136(5):417-22. doi: 10.4045/tidsskr.15.1174. eCollection 2016 Mar 15.Tidsskr Nor Laegeforen. 2016.PMID: 26983145Free article.English, Norwegian.