1. E.G. Fowler, PT, PhD, is Associate Professor, Department of Orthopaedic Surgery, Director of Research and Education and Peter William Shapiro Chair, UCLA/Orthopaedic Hospital Center for Cerebral Palsy, University of California at Los Angeles, and Faculty, Tarjan Center at UCLA, 22-70 Rehabilitation Center, 1000 Veteran Ave, Los Angeles, CA 90095-1795 (USA).
2. L.M. Knutson, PT, PhD, PCS, is Adjunct Faculty, Krannert School of Physical Therapy, University of Indianapolis, Indianapolis, Indiana. She was Professor, Department of Physical Therapy, Missouri State University, Springfield, Missouri, at the time this study was conducted.
3. S.K. DeMuth, PT, DPT, MS, is Assistant Professor of Clinical Physical Therapy, Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, Los Angeles, California.
4. K.L Siebert, PT, DPT, MEd, is Staff Physical Therapist and Clinical Instructor, South Bay Medical Therapy Unit, California Children's Services of Los Angeles County. She was Postdoctoral Fellow, Department of Orthopaedic Surgery, UCLA/Orthopaedic Hospital Center for Cerebral Palsy, University of California at Los Angeles, at the time this study was conducted.
5. V.D. Simms, PT, MPT, was Research Assistant, Department of Physical Therapy, Missouri State University, at the time this study was conducted.
6. M.H. Sugi, PT, DPT, is Staff Physical Therapist, Hollywood Presbyterian Medical Center, Los Angeles, California, and Staff Physical Therapist, Every Child Achieves, Studio City, California. She was Postdoctoral Fellow, Department of Orthopaedic Surgery, UCLA/Orthopaedic Hospital Center for Cerebral Palsy, University of California at Los Angeles, at the time this study was conducted.
7. R.B. Souza, PT, PhD, is Postdoctoral Scholar in Radiology and Biomedical Imaging, University of California, San Francisco, California. He was a doctoral student in the Division of Biokinesiology and Physical Therapy at the School of Dentistry, University of Southern California, at the time the study was conducted.
8. R. Karim, MBBS, PhD, is Assistant Professor of Research, Department of Preventive Medicine, Keck School of Medicine, University of Southern California.
9. S.P. Azen, PhD, is Professor, Department of Preventive Medicine, Keck School of Medicine, University of Southern California.