- Correspondence to Professor Dr Harald Burkhardt, Division of Rheumatology/CIRI, Johann Wolfgang Goethe University, Theodor-Stern-Kai 7, Frankfurt/Main D 60590, Germany;
- Received October 24, 2013
- Revised January 9, 2014
- Accepted January 24, 2014
- First published February 17, 2014.
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