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Previous Volume 351:298 July 15, 2004 Number 3 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: The article by Hviid et al. (April 1 issue)¹ that suggests no link between childhood vaccination against measles, mumps, and rubella and type 1 diabetes has an important limitation that is all too common in clinical research. The study draws its conclusions from a cohort of Danish children, a group that is more ethnically homogeneous than other groups, including American children.

The problem, of course, is that researchers must conduct many such studies in Scandinavian countries, because those countries have comprehensive national health care databases. Until we in the United States decide to keep more encompassing databases, . . . [Full Text of this Article]

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