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[10] In 1950, Richard Doll published research in the British Medical Journal showing a close link between smoking and lung cancer

Answer 26 Case-control Cohort Sample size Costs Study time Rare disease Rare exposure Multiple exposures Multiple outcomes Progression, spectrum of illness Disease rates Recall bias Loss to follow-up Selection bias Question 27: Which type of study (cohort or case-control) would you have done first

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These were also marginally successful, and remain on the market today

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