1. EG Fowler, PT, PhD, is Assistant Professor, UCLA Department of Orthopaedic Surgery, University Affiliated Program and the UCLA/Orthopaedic Hospital Center for Cerebral Palsy, 22–70 Rehabilitation Center, Los Angeles, CA 90095-1795 (USA) (efowler@mednet.ucla.edu).
2. TW Ho, PT, MPT, was Staff Physical Therapist, UCLA/Orthopaedic Hospital Center for Cerebral Palsy, at the time the study was performed
3. AI Nwigwe, BS, is a doctoral student in the Department of Biokinesiology and Physical Therapy, University of Southern California, Los Angeles, Calif. She was Research Assistant, UCLA/Orthopaedic Hospital Center for Cerebral Palsy, at the time the study was performed
4. FJ Dorey, PhD, is Professor, Departments of Orthopaedic Surgery and Biostatistics, University of California, Los Angeles