1. Autism Speaks Autism Treatment Network; Boston, Massachusetts
2. Cincinnati Children’s Hospital Medical Center, Division of Developmental and Behavioral Pediatrics, The Kelly O'Leary Center for Autism Spectrum Disorders, Cincinnati, Ohio;
3. Autism Intervention Research Network on Physical Health (Health Resources and Services Administration);
4. Massachusetts General Hospital, Biostatistics Center, Boston, Massachusetts;
5. Nationwide Children’s Hospital, Developmental and Behavioral Pediatrics, Columbus, Ohio; and
6. Ohio State University, College of Medicine, Columbus, Ohio