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