Reader's guide to critical appraisal of cohort studies: 2. Assessing potential for confounding.
Mamdani M; Sykora K; Li P; Normand SL; Streiner DL; Austin PC; Rochon PA; Anderson GM; BMJ (Clinical Research Ed.), 2005, vol. 330, issue 7497, p 960, ISSN 17561833. ISBN 17561833.

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