1. National Center on Birth Defects and Developmental Disabilities Centers for Disease Control and Prevention Atlanta Georgia USA
2. Department of Health Services Management and Policy, College of Public Health East Tennessee State University Johnson City Tennessee USA
3. Carter Consulting Inc Atlanta Georgia USA
4. Department of Health Policy and Management, Fay W. Boozman College of Public Health University of Arkansas for Medical Sciences Little Rock Arkansas USA
5. Oak Ridge Institute for Science and Education Oak Ridge Tennessee USA
6. Department of Physical Medicine and Rehabilitation University of Colorado School of Medicine Aurora Colorado USA
7. Children's Hospital Colorado Aurora Colorado USA