Shaw, Gary M.; Wasserman, Cathy R.; O'Malley, Cynthia D.; Nelson, Verne; Jackson, Richard J.
March of Dimes Birth Defects Foundation, California Birth Defects Monitoring Program, Emeryville, CA; Washington State Department of Health, Olympia, WA; California Department of Health Services, Berkeley, CA; and the National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA.