- Correspondence to Dr Irene E van der Horst-Bruinsma, Department of Rheumatology, VU University Medical Centre, 3A-47, PO Box 7057, Amsterdam1007 MB, The Netherlands;
- Received July 30, 2012
- Revised November 12, 2012
- Accepted December 2, 2012
- First published December 22, 2012.
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