- Correspondence to Dr Joachim Listing, Deutsches Rheuma-Forschungszentrum Berlin, Ein Leibniz Institut, Programmbereich Epidemiologie, Charitéplatz 1, Berlin 10117, Germany;
- Received January 28, 2016
- Revised May 19, 2016
- Accepted May 27, 2016
- First published June 15, 2016.
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