1. Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities, Division of Human Development and Disability, Atlanta, GA, USA
2. RTI International, Research Triangle, NC, USA
3. CommunicateHealth, Rockville, MD, USA
4. Oak Ridge Institute for Science and Education, Centers for Disease Control and Prevention, National Center on Birth Defects and Developmental Disabilities, Division of Human Development and Disability, Atlanta, GA, USA