1. Barron Associates, Inc., Charlottesville, Virginia, USA.
2. Department of Orthopaedics and Pediatrics, Duke University, Durham, North Carolina, USA.
3. Department of Pediatrics, University of Virginia, Charlottesville, Virginia, USA.
4. Department of Occupational Therapy, Mary Baldwin University, Staunton, Virginia, USA.
5. University of Virginia, Charlottesville, Virginia, USA.