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.
Bond A, Pajerowski W, Polsky D, Richards MR.Bond A, et al.Health Econ. 2017 Dec;26(12):1759-1766. doi: 10.1002/hec.3497. Epub 2017 Mar 28.Health Econ. 2017.PMID: 28370758
Patrick SW, Buntin MB, Martin PR, Scott TA, Dupont W, Richards M, Cooper WO.Patrick SW, et al. Among authors: richards m.Subst Abus. 2019;40(3):356-362. doi: 10.1080/08897077.2018.1488336. Epub 2018 Oct 9.Subst Abus. 2019.PMID: 29949454Free PMC article.