When are observational studies as credible as randomised trials?
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Published:2004-05
Issue:9422
Volume:363
Page:1728-1731
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ISSN:0140-6736
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Container-title:The Lancet
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language:en
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Short-container-title:The Lancet
Author:
Vandenbroucke Jan P
Cited by
434 articles.
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