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.
Lawrence WF, Fryback DG, Martin PA, Klein R, Klein BE.Lawrence WF, et al.J Clin Epidemiol. 1996 Nov;49(11):1239-45. doi: 10.1016/s0895-4356(96)00220-x.J Clin Epidemiol. 1996.PMID: 8892491
Fryback DG, Lawrence WF, Martin PA, Klein R, Klein BE.Fryback DG, et al. Among authors: lawrence wf.Med Decis Making. 1997 Jan-Mar;17(1):1-9. doi: 10.1177/0272989X9701700101.Med Decis Making. 1997.PMID: 8994146
Schapira MM, Lawrence WF, Katz DA, McAuliffe TL, Nattinger AB.Schapira MM, et al. Among authors: lawrence wf.Med Care. 2001 Mar;39(3):243-53. doi: 10.1097/00005650-200103000-00005.Med Care. 2001.PMID: 11242319