- Correspondence to Dr Anja Strangfeld, Deutsches Rheuma-Forschungszentrum Berlin, Ein Leibniz Institut, Programmbereich Epidemiologie, Charitéplatz 1, Berlin 10117, Germany;
- Received April 22, 2016
- Revised May 20, 2016
- Accepted June 19, 2016
- First published July 12, 2016.
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