- Correspondence to Dr Arnd Kleyer, Department of Internal Medicine 3, Rheumatology and Immunology, Friedrich Alexander University Erlangen-Nürnberg and Universitätsklinikum Erlangen, Erlangen 91054, Germany;
- Received September 18, 2017
- Revised January 26, 2018
- Accepted January 30, 2018
- First published February 23, 2018.
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