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Presented in part at the Clinical Research 2003 National Meeting (March 23, 2003), the National Meeting of the Pediatric Academic Societies (May 3, 2003), and the National Meeting of the Society for Academic Emergency Medicine (May 29, 2003).

This research was supported by GCRC grant M01-RR13297 from the National Center for Research Resources, National Institutes of Health, Bethesda, MD.

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