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Using Only Double-Blind Randomized Controlled Trials (RCTs)

observational health study results match RCTs well      web

webhttps://pubmed.ncbi.nlm.nih.gov/24782322/
authorAndrew Anglemyer, Hacsi T Horvath
publicationCochrane Database Syst Rev
date2014-04-01

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

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