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.
Wong RS, Ismail NA, Tan CC.Wong RS, et al. Among authors: ismail na.Ann Acad Med Singap. 2015 Apr;44(4):127-32.Ann Acad Med Singap. 2015.PMID: 26041636Free article.
Ismail NA, Jenatabadi HS.Ismail NA, et al.Transp Res Part A Policy Pract. 2014 Sep;67:212-224. doi: 10.1016/j.tra.2014.06.010. Epub 2014 Aug 17.Transp Res Part A Policy Pract. 2014.PMID: 32288368Free PMC article.