- Correspondence to Dr Uta Kiltz, Rheumazentrum Ruhrgebiet, St. Josefs-Krankenhaus, Landgrafenstr. 15, Herne 44652, Germany;
- Received May 16, 2013
- Revised November 14, 2013
- Accepted December 10, 2013
- First published January 7, 2014.
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