Affiliation: | 1.Division of Immunology and Rheumatology, Stanford University School of Medicine, Palo Alto, CA, USA ;2.Department of Rheumatology, Pontificia Universidad Católica de Chile, Santiago de Chile, Chile ;3.Department of Radiology, Musculoskeletal Imaging, Stanford University Medical Center, Palo Alto, CA, USA ;4.Department of Medicine, Rheumatology Section, Palo Alto VA Health Care System, Palo Alto, CA, USA ; |