Observational studies and randomized trials
- PMID: 11041757
- DOI: 10.1056/NEJM200010193431613
Observational studies and randomized trials
Comment on
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A comparison of observational studies and randomized, controlled trials.N Engl J Med. 2000 Jun 22;342(25):1878-86. doi: 10.1056/NEJM200006223422506. N Engl J Med. 2000. PMID: 10861324
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Randomized, controlled trials, observational studies, and the hierarchy of research designs.N Engl J Med. 2000 Jun 22;342(25):1887-92. doi: 10.1056/NEJM200006223422507. N Engl J Med. 2000. PMID: 10861325 Free PMC article.
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Observational studies and randomized trials.N Engl J Med. 2000 Oct 19;343(16):1195; author reply 1196-7. N Engl J Med. 2000. PMID: 11041758 No abstract available.
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