The role of 'confounding by indication' in assessing the effect of quality of care on disease outcomes in general practice: results of a case-control study

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Johan S de Koning^*, Niek S Klazinga, Peter J Koudstaal, Ad Prins, Gerard JJM Borsboom and Johan P Mackenbach

BMC Health Services Research 2005, 5:10 doi:10.1186/1472-6963-5-10