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den Ouden DJ, Dirkzwager AJ, Yzermans CJ.den Ouden DJ, et al. Among authors: yzermans cj.Scand J Prim Health Care. 2005 Sep;23(3):137-41. doi: 10.1080/02813430500202454.Scand J Prim Health Care. 2005.PMID: 16162464Free article.