1. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Center for State, Tribal, Local, and Territorial Support, Centers for Disease Control and Prevention, Atlanta, GA, USA
3. Maternal and Child Health Bureau, Health Resources and Services Administration, Rockville, MD, USA
4. National Center for Health Statistics, Centers for Disease Control and Prevention, Hyattsville, MD, USA