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Dyfyniad Arddull ChicagoSpeich, B., et al. A Meta-research Study Revealed Several Challenges in Obtaining Placebos for Investigator-initiated Drug Trials. Elsevier, 2020.
Dyfyniad MLASpeich, B., et al. A Meta-research Study Revealed Several Challenges in Obtaining Placebos for Investigator-initiated Drug Trials. Elsevier, 2020.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.