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.
Houlihan M, Pritchard W, Robinson J.Houlihan M, et al.Neuropsychobiology. 2001;44(1):54-8. doi: 10.1159/000054915.Neuropsychobiology. 2001.PMID: 11408794Clinical Trial.