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.
Heywood AE, Gidding HF, Riddell MA, McIntyre PB, MacIntyre CR, Kelly HA.Heywood AE, et al. Among authors: macintyre cr.Bull World Health Organ. 2009 Jan;87(1):64-71. doi: 10.2471/blt.07.046375.Bull World Health Organ. 2009.PMID: 19197406Free PMC article.
Seale H, Wang Q, Yang P, Dwyer DE, Wang X, Zhang Y, MacIntyre CR.Seale H, et al. Among authors: macintyre cr.Occup Med (Lond). 2010 Aug;60(5):335-9. doi: 10.1093/occmed/kqq037. Epub 2010 Apr 23.Occup Med (Lond). 2010.PMID: 20418403Clinical Trial.