- Correspondence to Dr Anne C Regierer, Deutsches Rheuma-Forschungszentrum Berlin, Ein Leibniz Institut, Programmbereich Epidemiologie, Charitéplatz 1, 10117 Berlin, Germany;
- Received April 10, 2017
- Revised June 13, 2017
- Accepted July 19, 2017
- First published August 19, 2017.
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