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.
Tan YK, Wee TC, Koh WP, Wang YT, Eng P, Tan WC, Seow A.Tan YK, et al. Among authors: koh wp.Lung Cancer. 2003 Jun;40(3):237-46. doi: 10.1016/s0169-5002(03)00038-2.Lung Cancer. 2003.PMID: 12781422
Koh WP, Wang R, Jin A, Yu MC, Yuan JM.Koh WP, et al.Br J Cancer. 2013 Mar 19;108(5):1182-8. doi: 10.1038/bjc.2013.25. Epub 2013 Jan 31.Br J Cancer. 2013.PMID: 23370206Free PMC article.