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.
Kälkner KM, Ginman C, Nilsson S, Bergström M, Antoni G, Ahlström H, Långström B, Westlin JE.Kälkner KM, et al. Among authors: ahlstrom h.Nucl Med Biol. 1997 May;24(4):319-25. doi: 10.1016/s0969-8051(97)00064-4.Nucl Med Biol. 1997.PMID: 9257330