1. Children’s Hospital Los Angeles, Los Angeles, California;
2. Department of Pediatrics, Keck School of Medicine, University of Southern California, Los Angeles, California;
3. Center for Autism & Neurodevelopmental Disorders, Department of Pediatrics, University of California, Irvine, Santa Ana, California;
4. Department of Developmental Behavioral Pediatrics, University of Rochester Medical Center, Rochester, New York;
5. Department of Physical Medicine and Rehabilitation, Spaulding Rehabilitation Hospital, Boston, Massachusetts;
6. Departments of Physical Medicine and Rehabilitation and
7. Division of General Academic Pediatrics, Massachusetts General Hospital, Boston, Massachusetts
8. Pediatrics, Harvard Medical School, Harvard University, Boston, Massachusetts; and