1. Center for Injury Research and Prevention, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
2. Violence Prevention Initiative, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
3. The Ohio State University College of Medicine, Columbus, Ohio.
4. Center for Autism Research, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.
5. Department of Psychiatry, Perelman School of Medicine at University of Pennsylvania, Philadelphia, Pennsylvania.
6. Division of Emergency Medicine, Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
7. PolicyLab, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania.