All materials in this volume are in the public domain and may be used or reproduced without permission from the Institute or the authors. Citation of the source is appreciated. The U.S. government does not endorse or favor any specific commercial product or company. Trade, proprietary, or company names appearing in this publication are used only because they are considered essential in the context of the studies described here.NIH Publication No. 00-4180Printed October 1999, Reprinted July 2000
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