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.
Nedaie HA, Mosleh-Shirazi MA, Allahverdi M.Nedaie HA, et al.J Med Phys. 2013 Jan;38(1):15-21. doi: 10.4103/0971-6203.106607.J Med Phys. 2013.PMID: 23533162Free PMC article.