1. Center for Rehabilitation, Occupational Therapy, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
2. Center for Health Assessment Research and Translation, University of Delaware, Newark, Delaware, USA
3. Departments of Pediatrics and Epidemiology, Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
4. Department of Child and Adolescent Psychiatry and Behavioral Sciences, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
5. Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
6. Division of Neurology, Children’s Hospital of Philadelphia, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA
7. Paul B Magnusson Professor and Chairman of Orthopedic Surgery, Department of Orthopedic Surgery, Perelman School of Medicine, University of Pennsylvania, Pennsylvania, USA
8. Division of Plastic and Reconstructive Surgery, Department of Surgery, Perelman School of Medicine, University of Pennsylvania, Pennsylvania, USA
9. Department of Orthopaedic Surgery, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA