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.
Liu FH, Dai HX, Gong TT, Zhang JY, Li J, Chen ZJ, Li LL, Chen YL, Liu S, Jiang CZ, Huang YH, Zhao YH, Wu QJ.Liu FH, et al. Among authors: zhang jy.Occup Environ Med. 2020 Oct;77(10):721-727. doi: 10.1136/oemed-2020-106434. Epub 2020 Jul 31.Occup Environ Med. 2020.PMID: 32737151