No abstract available
Publication types
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, Non-P.H.S.
MeSH terms
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Clinical Trials as Topic
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Cross-Sectional Studies
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Drug Approval / statistics & numerical data*
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Humans
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Product Surveillance, Postmarketing / standards*
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Time Factors
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United States
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United States Food and Drug Administration / organization & administration