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Observational study of upper gastrointestinal haemorrhage in elderly patients given selective cyclo-oxygenase-2 inhibitors or conventional non-steroidal anti-inflammatory drugs.
Mamdani M, Rochon PA, Juurlink DN, Kopp A, Anderson GM, Naglie G, Austin PC, Laupacis A. Mamdani M, et al. BMJ. 2002 Sep 21;325(7365):624. doi: 10.1136/bmj.325.7365.624. BMJ. 2002. PMID: 12242172 Free PMC article.
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. Mamdani M, et al. BMJ. 2005 Apr 23;330(7497):960-2. doi: 10.1136/bmj.330.7497.960. BMJ. 2005. PMID: 15845982 Free PMC article. Review.
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