1. Division of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, CA 90033, USA
2. Motor Development Lab, Department of Physical Therapy, Virginia Commonwealth University, Richmond, VA 23298, USA
3. Departments of Pediatrics and Neurology, Division of Neonatology, University of Virginia, Charlottesville, VA 22903, USA
4. Department of Pediatrics, Division of Neurodevelopmental and Behavioral Pediatrics, University of Virginia School of Medicine, Charlottesville, VA 22903, USA
5. Department of Neurology, Virginia Commonwealth University, Richmond, VA 23284, USA
6. Department of Pediatrics, Children’s Hospital of Richmond at VCU, Virginia Commonwealth University School of Medicine, Richmond, VA 23284, USA
7. Department of Physical Therapy, University of Virginia, Charlottesville, VA 22903, USA
8. Department of Counseling and Special Education, Virginia Commonwealth University, Richmond, VA 23284, USA
9. Department of Biostatistics, Virginia Commonwealth University School of Medicine, Richmond, VA 23284, USA