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.
Boulet JR, Ben-David MF, Burdick W, Ziv A, Gary N, Hambleton RK.Boulet JR, et al.Adv Health Sci Educ Theory Pract. 1998;3(2):89-100. doi: 10.1023/A:1009712810810.Adv Health Sci Educ Theory Pract. 1998.PMID: 12386446