1. Department of Pediatrics, Indiana University School of Medicine, Indianapolis, IN;
2. Autism Research Centre, Bloorview Research Institute, Holland Bloorview Kids Rehabilitation Hospital, Toronto, Ontario, Canada;
3. Department of Paediatrics, University of Toronto, Toronto, Ontario, Canada;
4. PLLC, Seattle, WA;
5. Department of Pediatrics, School of Medicine, University of Missouri, Columbia, MO;
6. Division of Developmental Medicine, Boston Children's Hospital, Boston, MA; and
7. Department of Pediatrics, School of Medicine, Oregon Health & Science University, Portland, OR.