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Frequency of multiple changes to prespecified primary outcomes of clinical trials completed between 2009 and 2017 in German university medical centers: A meta-research study | 42 |
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Frequency of multiple changes to prespecified primary outcomes of clinical trials completed between 2009 and 2017 in German university medical centers: A meta-research study | 2 | 5 | 1 | 1 | 3 | 3 | 2 |
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2023_Holst_etal.pdf | 73 |