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Чикаго-гийн эшлэл (17 дахь хэвлэлт)Speich, B., et al. A Meta-research Study Revealed Several Challenges in Obtaining Placebos for Investigator-initiated Drug Trials. Elsevier, 2020.
MLA -ийн эшлэл (9 дэх хэвлэлт)Speich, B., et al. A Meta-research Study Revealed Several Challenges in Obtaining Placebos for Investigator-initiated Drug Trials. Elsevier, 2020.
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