- Correspondence to Dr Denis Poddubnyy, Rheumatology, Med. Department I, Campus Benjamin Franklin, Charité Universitätsmedizin Berlin, Hindenburgdamm 30, Berlin 12203, Germany;
- Received July 7, 2013
- Revised November 22, 2013
- Accepted December 10, 2013
- First published January 3, 2014.
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