1. Department of Physical Medicine & Rehabilitation, University of Pittsburgh, Pittsburgh, Pennsylvania
2. Children’s Hospital of Pittsburgh, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania
3. The Biostatistics Center, Milken Institute of Public Health, George Washington University, Washington, DC
4. Department of Physical Therapy, Jefferson University, Philadelphia, Pennsylvania
5. Department of Physical Therapy, Fresno State University, Fresno, California
6. Department of Physical Therapy, Vanderbilt University, Nashville, Tennessee
7. Department of Surgery, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
8. Department of Psychology, University of Houston, Houston, Texas
9. Department of Neurosurgery, University of California, San Francisco, San Francisco
10. Center for Fetal Diagnosis and Treatment, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania
11. Department of Surgery, Vanderbilt University, Nashville, Tennessee
12. Department of Surgery, University of California, San Francisco, San Francisco
13. Department of Pediatrics, University of Washington, Seattle