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.
Elling CE, Thirstrup K, Nielsen SM, Hjorth SA, Schwartz TW.Elling CE, et al. Among authors: nielsen sm.Ann N Y Acad Sci. 1997 Apr 24;814:142-51. doi: 10.1111/j.1749-6632.1997.tb46152.x.Ann N Y Acad Sci. 1997.PMID: 9160966Review.No abstract available.
Nielsen SM, Nielsen LZ, Hjorth SA, Perrin MH, Vale WW.Nielsen SM, et al. Among authors: nielsen lz.Proc Natl Acad Sci U S A. 2000 Aug 29;97(18):10277-81. doi: 10.1073/pnas.97.18.10277.Proc Natl Acad Sci U S A. 2000.PMID: 10963687Free PMC article.