- Correspondence to Dr Rohit Aggarwal, Department of Medicine, Division of Rheumatology, University of Pittsburgh School of Medicine, Falk Medical Building, Suite 2B, 3601 Fifth Avenue, Pittsburgh, PA 15213, USA;
- RA and EC contributed equally to the manuscript and are co-first authors.
- Received May 6, 2012
- Revised December 9, 2012
- Accepted December 29, 2012
- First published February 19, 2013.
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