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.
Hu X, Qu X.Hu X, et al. Among authors: qu x.Ergonomics. 2013;56(5):856-67. doi: 10.1080/00140139.2013.776705. Epub 2013 Mar 21.Ergonomics. 2013.PMID: 23514332
Hu X, Qu X.Hu X, et al. Among authors: qu x.Biomed Eng Online. 2016 Jun 1;15(1):61. doi: 10.1186/s12938-016-0194-x.Biomed Eng Online. 2016.PMID: 27251528Free PMC article.Review.