Affiliation: | 1. Division of Rheumatology, University of Pennsylvania, 1407 Penn Tower, 3400 Spruce Street, Philadelphia, PA, 19104, USA 2. Rush University Medical Center, Chicago, IL, USA 3. University of Connecticut, Hartford, CT, USA 4. Weiss Memorial Hospital, Chicago, IL, USA 5. Stroger Hospital of Cook County, Chicago, IL, USA 6. University of Illinois, Chicago, IL, USA
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