Flow chart showing the search, the major reason for exclusions of studies and the final number of studies included in this review

<p><b>Copyright information:</b></p><p>Taken from "A systematic review of patient and health system characteristics associated with late referral in chronic kidney disease"</p><p>http://www.biomedcentral.com/1471-2369/9/3</p><p>BMC Nephrology 2008;9():3-3.</p><p>Published online 25 Feb 2008</p><p>PMCID:PMC2291456.</p><p></p