- Correspondence to Dr Joachim Sieper, Professor of Rheumatology, Charité Medical School, Department of Medicine 1, Campus Benjamin Franklin, Hindenburgdamm 30, Berlin 12200, Germany;
- Received November 22, 2013
- Revised January 22, 2014
- Accepted January 24, 2014
- First published February 18, 2014.
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