Department of Pediatrics (Dr McIntyre), University of Utah, Salt Lake City, Utah; Department of Rehabilitation Services (Dr Dunn and Mr David), Children's Hospital Los Angeles, Los Angeles, California; Developmental Neuroscience and Neurogenetics Program (Dr Smith), The Saban Research Institute, Division of Developmental-Behavioral Pediatrics, Children's Hospital Los Angeles, Los Angeles, California; Department of Pediatrics (Dr Smith), Keck School of Medicine, University of Southern California, Los Angeles, California.

Correspondence: Melissa McIntyre, PT, DPT, Department of Pediatrics, University of Utah, 15 North 2030 East, EIGH 2250A, Salt Lake City, UT 84112 ([email protected]) or Beth A. Smith, PT, DPT, PhD, Developmental Neuroscience and Neurogenetics Program, The Saban Research Institute, Division of Developmental-Behavioral Pediatrics, Children's Hospital Los Angeles, 4650 Sunset Blvd (MS#183), Los Angeles, CA 90027 ([email protected]).

The authors declare no conflicts of interest.