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Correction for vol. 54, p. 677
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An authors' error occurred in the paper by Evans and others (2000;54:677–86). Because of a computing error, missing data were not excluded from some of the analyses in this paper, resulting in minor inaccuracies to table 4. This in no way changes the conclusions of the paper. A “corrected” table 4, together with minor textual revisions can be obtained from the authors.

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