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This study was supported by Grant No. 95-31825A-POP/PCE and 96-41812A-WER between the National Academy of Sciences and John D. and Catherine T. MacArthur Foundation and Task Order #34, NO1-OD-4139 of the Department of Health and Human Services. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the views of the organizations or agencies that provided support for the project.
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