1. Weinberg Family Cerebral Palsy Center Columbia University Medical Center New York NY USA
2. Department of Orthopaedic Surgery Columbia University Medical Center New York NY USA
3. Department of Epidemiology Mailman School of Public Health Columbia University New York NY
4. Department of Rehabilitation and Regenerative Medicine Columbia University Medical Center New York NY USA
5. Department of Orthopedic Surgery Columbia University, The Spine Hospital at NY‐Presbyterian/Allen Hospital New York NY USA