- 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 March 10, 2014
- Revised July 12, 2014
- Accepted July 17, 2014
- First published August 4, 2014.
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