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.
Larson CO, Hays RD, Nelson EC.Larson CO, et al. Among authors: hays rd.Qual Life Res. 1992 Aug;1(4):247-9. doi: 10.1007/BF00435633.Qual Life Res. 1992.PMID: 1299455Clinical Trial.
Nelson EC, Larson CO, Hays RD, Nelson SA, Ward D, Batalden PB.Nelson EC, et al. Among authors: hays rd.QRB Qual Rev Bull. 1992 Sep;18(9):284-92. doi: 10.1016/s0097-5990(16)30545-0.QRB Qual Rev Bull. 1992.PMID: 1437092