1. Division of Pediatric Neurology, Department of Neurology, School of Medicine, Washington University in St Louis and St Louis Children’s Hospital, St Louis, Missouri;
2. Department of Pediatrics, University of Toronto and Holland Bloorview Kids Rehabilitation Hospital, Toronto, Ontario, Canada;
3. Departments of Child Health, Neurology, Genetics, and Cellular and Molecular Medicine, College of Medicine – Phoenix, University of Arizona and Cerebral Palsy and Pediatric Movement Disorders Program, Barrow Neurological Institute, Phoenix Children’s Hospital, Phoenix, Arizona;
4. Department of Paediatrics, Monash University, Melbourne, Australia; and
5. Louisiana State University Health Sciences Center New Orleans and Children's Hospital of New Orleans, New Orleans, Louisiana