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.
Ahmad MS, Bhayat A, Zafar MS, Al-Samadani KH.Ahmad MS, et al. Among authors: zafar ms.Int J Environ Res Public Health. 2017 Apr 20;14(4):445. doi: 10.3390/ijerph14040445.Int J Environ Res Public Health. 2017.PMID: 28425972Free PMC article.