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Ytterstad K, Granan LP, Engebretsen L.Ytterstad K, et al. Among authors: granan lp.Tidsskr Nor Laegeforen. 2011 Feb 4;131(3):248-50. doi: 10.4045/tidsskr.10.0536.Tidsskr Nor Laegeforen. 2011.PMID: 21304574Free article.Norwegian.