1. Department of Pediatrics, University of Arizona, Tucson, Arizona, USA
2. Department of Epidemiology, Colorado School of Public Health, University of Colorado, Aurora, Colorado, USA
3. Department of Epidemiology, The University of Iowa, Iowa City, Iowa, USA
4. National Center on Birth Defects and Developmental Disabilities, Centers for Disease Control and Prevention, Atlanta, Georgia, USA
5. New York State Department of Health, Albany, New York, USA
6. Department of Neurology, School of Medicine and Dentistry, University of Rochester Medical Center, Rochester, New York, USA
7. Physical Medicine and Rehabilitation, School of Medicine, University of Colorado, Aurora, Colorado, USA
8. Department of Pediatrics, Weill Cornell Medical College, New York, New York, USA