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.
Venekamp RP, Hoogland J, van Smeden M, Rovers MM, De Sutter AI, Merenstein D, van Essen GA, Kaiser L, Liira H, Little P, Bucher HC, Reitsma JB.Venekamp RP, et al. Among authors: hoogland j.BMJ Open. 2021 Jul 1;11(7):e047186. doi: 10.1136/bmjopen-2020-047186.BMJ Open. 2021.PMID: 34210729Free PMC article.