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.
Piyaratna N, Emeleus G, Arnold A, Metcalfe P.Piyaratna N, et al. Among authors: metcalfe p.Australas Radiol. 1999 May;43(2):210-4. doi: 10.1046/j.1440-1673.1999.00637.x.Australas Radiol. 1999.PMID: 10901904
Metcalfe P, Tangboonduangjit P, White P.Metcalfe P, et al.Phys Med Biol. 2004 Aug 21;49(16):3629-37. doi: 10.1088/0031-9155/49/16/010.Phys Med Biol. 2004.PMID: 15446793