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.
Karpf M, Perman J, Lofgren R, Melgar S, Butler F, Day Z, Clark M, Claypool JO, Gilbert P, Gombeski W, Higdon CM.Karpf M, et al. Among authors: lofgren r.Acad Med. 2007 Dec;82(12):1163-71. doi: 10.1097/ACM.0b013e318159e155.Acad Med. 2007.PMID: 18046120
Karpf M, Lofgren R.Karpf M, et al. Among authors: lofgren r.Acad Med. 2012 May;87(5):555-6. doi: 10.1097/ACM.0b013e31824d4237.Acad Med. 2012.PMID: 22531588
Karpf M, Lofgren R.Karpf M, et al. Among authors: lofgren r.Acad Med. 2012 Jun;87(6):691-3. doi: 10.1097/ACM.0b013e318253cdbc.Acad Med. 2012.PMID: 22643376