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.
Ghaly M, Du Y, Fung GS, Tsui BM, Links JM, Frey E.Ghaly M, et al. Among authors: tsui bm.Phys Med Biol. 2014 Jun 21;59(12):2935-53. doi: 10.1088/0031-9155/59/12/2935. Epub 2014 May 19.Phys Med Biol. 2014.PMID: 24841729Free PMC article.
Feng T, Wang J, Fung G, Tsui B.Feng T, et al.Phys Med Biol. 2016 Jan 7;61(1):151-68. doi: 10.1088/0031-9155/61/1/151. Epub 2015 Dec 1.Phys Med Biol. 2016.PMID: 26624887