An official website of the United States government
The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before
sharing sensitive information, make sure you’re on a federal
government site.
The site is secure.
The https:// ensures that you are connecting to the
official website and that any information you provide is encrypted
and transmitted securely.
Tan PT, Cro S, Van Vogt E, Szigeti M, Cornelius VR.Tan PT, et al. Among authors: cro s.BMC Med Res Methodol. 2021 Apr 15;21(1):72. doi: 10.1186/s12874-021-01261-6.BMC Med Res Methodol. 2021.PMID: 33858355Free PMC article.Review.
Cro S, Smith C, Wilson R, Cornelius V.Cro S, et al.Trials. 2018 Oct 3;19(1):534. doi: 10.1186/s13063-018-2914-y.Trials. 2018.PMID: 30285894Free PMC article.