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.
Huang CN, Chan CT.Huang CN, et al. Among authors: chan ct.Int J Environ Res Public Health. 2014 Apr 16;11(4):4233-48. doi: 10.3390/ijerph110404233.Int J Environ Res Public Health. 2014.PMID: 24743841Free PMC article.