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