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.
Varela-Mato V, Cancela JM, Ayan C, Martín V, Molina A.Varela-Mato V, et al. Among authors: cancela jm.Int J Environ Res Public Health. 2012 Aug;9(8):2728-2741. doi: 10.3390/ijerph9082728. Epub 2012 Aug 2.Int J Environ Res Public Health. 2012.PMID: 23066393Free PMC article.