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*<b>[http://www.kidney.de/mlpefetch.php?search=15860831 Readers guide to critical appraisal of cohort studies: 3 Analytical strategies to reduce confounding ]</b> BMJ 2005; 330(7498) ; 1021-3 Normand SL; Sykora K; Li P; Mamdani M; Rochon PA; Anderson GM
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