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Siersma V, Waldemar G, Waldorff FB.Siersma V, et al.Scand J Prim Health Care. 2013 Mar;31(1):7-12. doi: 10.3109/02813432.2012.754092. Epub 2013 Jan 17.Scand J Prim Health Care. 2013.PMID: 23327115Free PMC article.