THE NATIONAL ACADEMIES PRESS 500 Fifth Street, NW Washington, DC 20001
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.
This study was supported by Contract No. 10001173 between the National Academy of Sciences and the U.S. Navy, by purchase order SAQMMA13M2120 from the U.S. Department of State to the National Academy of Sciences, and by internal support from the National Academy of Sciences. 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.
International Standard Book Number-13: 978-0-309-30245-6
International Standard Book Number-10: 0-309-30245-5
Additional copies of this report are available for sale from The National Academies Press, 500 Fifth Street, N.W., Keck 360, Washington, DC 20001; (800) 624-6242 or (202) 334-3313; Internet, http://www.nap.edu/.
Copyright 2014 by the National Academy of Sciences. All rights reserved.
Printed in the United States of America