- Correspondence to Dr Joshua F Baker, Division of Rheumatology, Department of Medicine, 8 Penn Tower Building, 34th and Civic Center Blvd., Hospital of the University of Pennsylvania, Philadelphia, PA 19104, USA;
- Received November 3, 2014
- Revised May 8, 2015
- Accepted June 6, 2015
- First published June 19, 2015.
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