- Correspondence to Professor Ulf Müller-Ladner, Department of Rheumatology and Clinical Immunology, Justus-Liebig University Giessen, Kerckhoff Clinic, Benekestrasse 2, Bad Nauheim 61231, Germany;
- Received May 23, 2013
- Revised July 27, 2013
- Accepted September 8, 2013
- First published October 11, 2013.
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