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BMJ. 1999 Jul 31;319(7205):312-5.

Methods in health services research. Interpreting the evidence: choosing between randomised and non-randomised studies.

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London School of Hygiene and Tropical Medicine, London WC1E 7HT. m.mckee@lshtm.ac.uk
PMID:
10426754
PMCID:
PMC1126943
[Indexed for MEDLINE]
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