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.
Chen J, Rizzo JA.Chen J, et al.Adv Health Econ Health Serv Res. 2010;22:221-31. doi: 10.1108/s0731-2199(2010)0000022013.Adv Health Econ Health Serv Res. 2010.PMID: 20575235
Chen J, Rizzo JA, Ortega AN.Chen J, et al.J Health Care Poor Underserved. 2011 Aug;22(3):1059-74. doi: 10.1353/hpu.2011.0070.J Health Care Poor Underserved. 2011.PMID: 21841296