Objectives: "To compare the Medicaid enrollment of U.S.-born citizens to non-citizen immigrants who immigrated before 1996, both before and after welfare reform, and to determine if variation in state Medicaid policies modified the effects of welfare reform on immigrants." Methodology section may be helpful. Subsequently published as an article in Health Services Research, 2004 Oct 39(5): 1509-1526.

"This paper explores various methodological issues relating to immigrant health, including the definition of an immigrant, the
assessment of immigrant status, and sampling and recruitment strategies for studies relating to immigrant health."