1. Nisonger Center, Ohio State University, Columbus, Ohio.
2. Biostatistics Program, Department of Pediatrics, University of Arkansas for Medical Sciences, Little Rock, Arkansas.
3. Biostatistics, College of Public Health, Ohio State University, Columbus, Ohio.
4. Department of Psychiatry and Behavioral Sciences, David Geffen School of Medicine UCLA - Semel Institute, University of California, Los Angeles, California.
5. Department of Psychiatry, Indiana University School of Medicine, Indianapolis, Indiana.
6. Kennedy Krieger Institute, Baltimore Maryland.
7. Marcus Autism Center, Atlanta, Georgia.
8. National Institute of Mental Health, Bethesda, Maryland.