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 report was supported by funding from the Department of Veterans Affairs, the Alfred P. Sloan Foundation, Philips Medical Systems, (formerly part of Agilent Technologies’ Healthcare Solutions Group, and before that, part of Hewlett-Packard), KeraVision, Inc., and Pfizer, Inc. 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.