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.
PLoS Med. 2023 Oct 31;20(10):e1004306. doi: 10.1371/journal.pmed.1004306. eCollection 2023 Oct.
PLoS Med. 2023.
PMID: 37906614
Free PMC article.