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    NOTICE: The project that is the subject of this report was approved by the Governing Board of the National Research Council, whose members are drawn from the councils of the National Academy of Sciences, the National Academy of Engineering, and the Institute of Medicine. The members of the committee responsible for the report were chosen for their special competences and with regard for appropriate balance.

    Support for this project was provided by the Center for Public Domain (under an unnumbered grant), the James D. and Catherine T. MacArthur Foundation (under grant no. 02-73708-GEN), the National Library of Medicine (under purchase order no. 467-MZ-200750), the National Oceanic and Atmospheric Administration/National Weather Service (under an unnumbered purchase order), and the National Science Foundation (under grant no. GEO-0223581). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the views of the organizations or agencies that provided support for the project.

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