1. MassGeneral Hospital for Children, Boston, Massachusetts;
2. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts;
3. Department of Physical Medicine and Rehabilitation, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania;
4. Children’s Hospital of Pittsburgh of UPMC, Pittsburgh, Pennsylvania;
5. Nationwide Children’s Hospital, Columbus, Ohio;
6. Department of Pediatrics, The Ohio State University, Columbus, Ohio;
7. Department of Child Psychiatry, New York University School of Medicine, New York, New York;
8. Children’s Hospital at Montefiore, Bronx, New York;
9. Albert Einstein College of Medicine, Bronx, New York; and
10. Department of Psychiatry and Biobehavioral Sciences and
11. UCLA–Semel Institute for Neurosciences and Human Behavior, David Geffen School of Medicine at UCLA, Los Angeles, California