Randomised and non-randomised studies: threats to internal and external validity

CFB Sanderson ; M McKee ORCID logo ; A Britton ; N Black ; K McPherson ; C Bain ; (2001) Randomised and non-randomised studies: threats to internal and external validity. In: Stevens, A; et al, (eds.) Advanced Handbook of Methods in Evidence Based Healthcare. Sage Publications, pp. 95-115. https://researchonline.lshtm.ac.uk/id/eprint/17766
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