1. Centers for Disease Control and Prevention, Atlanta, GA, USA
2. Department of Epidemiology, University of Iowa, Iowa City, IA, USA
3. Department of Epidemiology, University of Colorado, Aurora, CO, USA
4. Department of Pediatrics, University of Arizona, Tucson, AZ, USA
5. Department of Neurology, University of Rochester, Rochester, NY, USA
6. Department of Physical Medicine and Rehabilitation, University of Colorado School of Medicine and Children’s Hospital Colorado, Aurora, CO, USA
7. Department of Pediatrics, Weill Cornell Medical College, New York, NY, USA
8. Centers for Disease Control and Prevention, National Center for Birth Defects and Developmental Disabilities, DHDD, Rare Disorders and Health Outcomes team, Atlanta, GA, USA