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.
Perkins GD, Couper K, Connolly B, Baillie JK, Bradley JM, Dark P, De Soyza A, Gorman E, Gray A, Hamilton L, Hart N, Ji C, Lall R, McGowan N, Regan S, Simonds AK, Skilton E, Stallard N, Stimpson E, Yeung J, McAuley DF.Perkins GD, et al. Among authors: mcauley df.Trials. 2020 Jul 29;21(1):687. doi: 10.1186/s13063-020-04617-3.Trials. 2020.PMID: 32727624Free PMC article.