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

Sanderson, CFB; McKee, M; Britton, A; Black, N; McPherson, K; Bain, C; (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. http://researchonline.lshtm.ac.uk/id/eprint/17766

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