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Supertopics:
observational health study results match RCTs well

comparing observational studies and controlled trials      web

webhttps://pubmed.ncbi.nlm.nih.gov/10861324/
authorK Benson, A J Hartz
publicationN Engl J Med
date2000-06-22

Documents:
comparing observational studies and controlled trials
webK Benson, A J HartzN Engl J Med2000-06-22

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