- Correspondence to Dr L A Trouw, Department of Rheumatology, C1-R, Leiden University Medical Center (LUMC), PO Box 9600, Leiden 2300 RC, The Netherlands; PCEHM, JA and JS contributed equally
- Received March 19, 2013
- Revised May 28, 2013
- Accepted June 26, 2013
- First published July 19, 2013.
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