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Reader's guide to critical appraisal of cohort studies: 1. Role and design.

Rochon PA, Gurwitz JH, Sykora K, Mamdani M, Streiner DL, Garfinkel S, Normand SL, Anderson GM. Reader's guide to critical appraisal of cohort studies: 1. Role and design. BMJ. 2005 Apr 16; 330(7496):895-7.

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