This study was supported by multiple contracts and grants between the National Academy of Sciences and the National Institute of Environmental Health Sciences, National Institutes of Health (Contract N01-OD-4-2193, TO#43); National Center for Environmental Health and Agency for Toxic Substances and Disease Registry, Centers for Disease Control and Prevention (Contract No. 200-2000-00629, TO#7); National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention (Contract 0000166930); National Health and Environment Effects Research Laboratory and National Center for Environmental Research, U.S. Environmental Protection Agency (Contract 282-99-0045, TO#5); American Chemistry Council (unnumbered grant); Exxon-Mobil Corporation (unnumbered grant); and Brita Water Research Institute (unnumbered grant). Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the organizations and agencies that provided support for this 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.