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.
Herring A, Wilper A, Himmelstein DU, Woolhandler S, Espinola JA, Brown DF, Camargo CA Jr.Herring A, et al. Among authors: himmelstein du.Acad Emerg Med. 2009 Jul;16(7):609-16. doi: 10.1111/j.1553-2712.2009.00428.x. Epub 2009 Jun 15.Acad Emerg Med. 2009.PMID: 19538503Free article.
Himmelstein DU, Woolhandler S, Wolfe SM.Himmelstein DU, et al.Int J Health Serv. 1992;22(3):381-96. doi: 10.2190/5FBA-VEKK-K2DK-JF8V.Int J Health Serv. 1992.PMID: 1644504