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.
Luker JA, Craig LE, Bennett L, Ellery F, Langhorne P, Wu O, Bernhardt J.Luker JA, et al.BMC Med Res Methodol. 2016 May 10;16:52. doi: 10.1186/s12874-016-0156-9.BMC Med Res Methodol. 2016.PMID: 27164839Free PMC article.Clinical Trial.
Grimmer K, Dizon JM, Milanese S, King E, Beaton K, Thorpe O, Lizarondo L, Luker J, Machotka Z, Kumar S.Grimmer K, et al.BMC Med Res Methodol. 2014 May 10;14:63. doi: 10.1186/1471-2288-14-63.BMC Med Res Methodol. 2014.PMID: 24885893Free PMC article.