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.
van Leeuwen N, Walgaard C, van Doorn PA, Jacobs BC, Steyerberg EW, Lingsma HF.van Leeuwen N, et al. Among authors: steyerberg ew.PLoS One. 2019 Feb 20;14(2):e0211404. doi: 10.1371/journal.pone.0211404. eCollection 2019.PLoS One. 2019.PMID: 30785890Free PMC article.