1 Departments of Surgery, Medicine (Rheumatology), and Pediatrics, and Center for Health Services & Outcomes Research, Institute for Public Health and Medicine, Feinberg School of Medicine, Northwestern University, Chicago, Illinois.
2 Department of Orthopaedic Surgery, Virginia Commonwealth University Health, Richmond, Virginia.
3 Departments of Physical Therapy, Orthopaedic Surgery, and Rheumatology, Virginia Commonwealth University, Richmond, Virginia.