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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 competencies and with regard for appropriate balance.
This study was supported by the U.S. Department of Energy, Office of Industrial Technologies, and the National Institute of Occupational Safety and Health, Grant No. DE-AM01-99PO80016. The views and conclusions contained in this document are those of the authors and do not necessarily reflect the view of the Department of Energy or the National Institute of Occupational Safety and Health. .
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