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.
Lampl M, Johnson ML.Lampl M, et al.Am J Hum Biol. 1997;9(3):343-355. doi: 10.1002/(SICI)1520-6300(1997)9:3<343::AID-AJHB7>3.0.CO;2-Z.Am J Hum Biol. 1997.PMID: 28561300