This study was supported by the Elizabeth R. Griffin Research Foundation, the National Center for Infectious Disease, and Contract No. N01-OD-4-2139, Task Order 118 between the National Institutes of Health and the National Academy of Sciences. 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.
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.
The content of this publication does not necessarily reflect the views or policies of the National Institutes of Health, nor does mention of trade names, commercial products, or organizations imply endorsement by the US government.
The Internet information and government forms referenced in this report were correct, to the best of our knowledge, at the time of publication. It is important to remember, however, the dynamic nature of the Internet. Resources that are free and publicly available one day may require a fee or restrict access the next, and the location of items may change as menus and homepages are reorganized.