1. Pediatric Neuromotor Research Clinic, Civitan International Research Center, University of Alabama at Birmingham, Birmingham, AL, .
2. Department of Physical Therapy, Pediatric Neuromotor Research Clinic, Civitan International Research Center, University of Alabama at Birmingham, Birmingham, AL
3. Department of Pediatrics, University of Alabama at Birmingham and Department of Physical Medicine and Rehabilitation, The Children's Hospital of Alabama, Birmingham, AL
4. Georgetown Center on Health and Education, Georgetown University, Washington, DC