Reader's guide to critical appraisal of cohort studies: 2. Assessing potential for confounding.
Mamdani, Muhammad; Sykora, Kathy; Ping Li; Normand, Sharon-Lise T.; Streiner, David L.; Austin, Peter C.; Rochon, Paula A.; Anderson, Geoffrey M.; BMJ: British Medical Journal (International Edition), 2005, vol. 330, issue 7497, p 960, ISSN 09598146. ISBN 17561833.

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