- Correspondence to Dr Denis Poddubnyy, Rheumatology, Med. Department I, Campus Benjamin Franklin, Charité Universitätsmedizin Berlin, Hindenburgdamm 30, Berlin 12203, Germany;
- Received March 4, 2014
- Revised April 23, 2014
- Accepted May 1, 2014
- First published May 20, 2014.
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