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.
Li Y, Wong T, Chung J, Guo YP, Hu JY, Guan YT, Yao L, Song QW, Newton E.Li Y, et al.Am J Ind Med. 2006 Dec;49(12):1056-65. doi: 10.1002/ajim.20395.Am J Ind Med. 2006.PMID: 17096360
Or P, Chung J, Wong T.Or P, et al.Workplace Health Saf. 2012 Dec;60(12):511-5. doi: 10.1177/216507991206001202.Workplace Health Saf. 2012.PMID: 23210700Clinical Trial.