1. Departments of Bioengineering, University of California–San Diego, La Jolla, California.
2. Orthopaedic Surgery, University of California–San Diego, La Jolla, California.
3. Institute for Engineering in Medicine, University of California–San Diego, La Jolla, California.
4. Division of Rheumatology, Allergy, and Immunology, University of California–San Diego, La Jolla, California.