1. Division of Human Development and Disability, National Center on Birth Defects and Developmental Disabilities, CDC, Atlanta, Georgia
2. Oak Ridge Institute for Science and Education, CDC Research Participation Programs, Oak Ridge, Tennessee
3. Office of Epidemiology and Research, Maternal and Child Health Bureau, Health Resources and Services Administration, Rockville, Maryland
4. Office of the Director, National Center on Birth Defects and Developmental Disabilities, CDC, Atlanta, Georgia