1. The University of Iowa, Iowa City, Iowa;
2. University of Colorado, Aurora, Colorado;
3. University of Rochester, Rochester, New York;
4. The University of Arizona, Tucson, Arizona;
5. New York State Department of Health, Albany, New York;
6. State University of New York, Albany, Rensselaer, New York; and
7. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia