- Correspondence to Dr TWJ Huizinga, Chairman, Department of Rheumatology, C1-41 Leiden University Medical Center, Albinusdreef 2, PO Box 9600, Leiden 2300RC, The Netherlands;
- Received August 6, 2013
- Revised October 23, 2013
- Accepted October 24, 2013
- First published December 2, 2013.
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