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.
Heck DA, Melfi CA, Mamlin LA, Katz BP, Arthur DS, Dittus RS, Freund DA.Heck DA, et al.Med Care. 1998 May;36(5):661-9. doi: 10.1097/00005650-199805000-00006.Med Care. 1998.PMID: 9596057
Heck DA, Clingman JK, Kettelkamp DG.Heck DA, et al.Orthopedics. 1992 Jan;15(1):23-8. doi: 10.3928/0147-7447-19920101-07.Orthopedics. 1992.PMID: 1738707
Callahan CM, Drake BG, Heck DA, Dittus RS.Callahan CM, et al. Among authors: heck da.J Arthroplasty. 1995 Apr;10(2):141-50. doi: 10.1016/s0883-5403(05)80120-2.J Arthroplasty. 1995.PMID: 7798094