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.
Douglas TD, Ramakrishnan U, Kable JA, Singh RH.Douglas TD, et al. Among authors: singh rh.Health Qual Life Outcomes. 2013 Dec 30;11:218. doi: 10.1186/1477-7525-11-218.Health Qual Life Outcomes. 2013.PMID: 24373161Free PMC article.