1. University of California San Diego, Department of Bioengineering, 9500 Gilman Drive, La Jolla, California 92093-0412, United StatesbVA San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, California 92161, United States
2. VA San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, California 92161, United StatescUniversity of California San Diego, Department of Orthopaedic Surgery, 9500 Gilman Drive, La Jolla, California 92093-0863, United States
3. University of California San Diego, Department of Bioengineering, 9500 Gilman Drive, La Jolla, California 92093-0412, United StatesbVA San Diego Healthcare System, 3350 La Jolla Village Drive, San Diego, California 92161, United StatescUniversity of Calif