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Previous Volume 344:1168 April 12, 2001 Number 15 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 observations in the report by Sveinbjörnsdóttir et al. (Dec. 14 issue)¹ are important, but we believe they support a predominantly environmental cause rather than a major genetic contribution to the etiology of Parkinson's disease.

Figure 1 of the article is a clear example of horizontal rather than vertical clustering, which suggests environmental causation. As the authors recognize, the fact that the risk ratio for Parkinson's disease in the siblings of patients with Parkinson's disease was different from the risk ratio in the offspring of such patients also argues against genetic causation. The relative risk of Parkinson's . . . [Full Text of this Article]

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