1. LaKind Associates, LLC, Catonsville, MD, USA
2. Department of Epidemiology and Public Health, University of Maryland School of Medicine, Baltimore, MD, USA
3. Center for Autism Spectrum Disorders, Children’s National Health System, The George Washington University Medical Center, Rockville, MD, USA
4. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, GA, USA