1. PolicyLab, The Children's Hospital of Philadelphia, Philadelphia, PA;
2. Division of Developmental and Behavioral Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA;
3. Center for Autism Research, Children's Hospital of Philadelphia, Philadelphia, PA;
4. Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA;
5. Meyer Center for Developmental Pediatrics & Autism, Department of Pediatrics, Baylor College of Medicine and Texas Children's Hospital, Houston, TX ;
6. Department of Pediatrics, Children's Hospital of Philadelphia, Philadelphia, PA;
7. Division of Developmental-Behavioral Pediatrics Boston Medical Center, Boston, MA;
8. Boston University School of Medicine, Boston, MA;
9. Language Services Department, Children's Hospital of Philadelphia, Philadelphia, PA; and
10. Division of Developmental and Behavioral Pediatrics, Akron Children's Hospital, Akron, OH.