1. Thurston Arthritis Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
2. Joint Department of Biomedical Engineering, University of North Carolina and North Carolina State University, Raleigh, NC 27606, USA
3. School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA
4. Department of Pediatrics, Rush University Medical Center, Chicago, IL 60612, USA
5. Department of Orthopedic Surgery, Thomas Jefferson University, Philadelphia, PA 19144, USA
6. Division of Rheumatology, Allergy, and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA