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.
Engel ML, Winiarski DA, Reidy BL, Brennan PA.Engel ML, et al. Among authors: reidy bl.J Dev Behav Pediatr. 2018 Sep;39(7):573-579. doi: 10.1097/DBP.0000000000000590.J Dev Behav Pediatr. 2018.PMID: 29905621Free PMC article.