- Correspondence to Professor Denis Poddubnyy, Rheumatology, Med. Department I, Campus Benjamin Franklin, Charité Universitätsmedizin Berlin, Hindenburgdamm 30, Berlin 12203, Germany;
- Received January 16, 2016
- Revised March 26, 2016
- Accepted April 11, 2016
- First published April 28, 2016.
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