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NOTICE: The project that is the subject of this report was approvedby the Governing Board of the National Research Council, whose membersare 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 chosenfor their special competences and with regard for appropriate balance.

Support for this project was provided by the Food and Nutrition Service,U.S. Department of Agriculture under contract number 59-3198-9-027.The opinions or conclusions expressed herein are those of the committeeand do not necessarily reflect those of the funders.

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