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.
Pearce A, Elliman D, Law C, Bedford H; Millennium Cohort Study Child Health Group.Pearce A, et al.Arch Dis Child. 2009 Jan;94(1):49-51. doi: 10.1136/adc.2007.132647. Epub 2008 May 7.Arch Dis Child. 2009.PMID: 18463124