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Nielsen AB, Gannik D, Siersma V, Olivarius Nde F.Nielsen AB, et al. Among authors: gannik d.Scand J Prim Health Care. 2011 Sep;29(3):157-64. doi: 10.3109/02813432.2011.585542. Epub 2011 Jun 27.Scand J Prim Health Care. 2011.PMID: 21707235Free PMC article.