- Correspondence to Professor Jonathan Kay, Division of Rheumatology, Department of Medicine, UMass Memorial Medical Center and University of Massachusetts Medical School, Memorial Campus, 119 Belmont Street, Worcester, MA 01605, USA; .
- Received May 13, 2013
- Revised July 6, 2013
- Accepted July 9, 2013
- First published July 29, 2013.
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