- Correspondence to Dr Joachim Listing, Deutsches Rheuma-Forschungszentrum Berlin, Ein Leibniz Institut, Programmbereich Epidemiologie, Charitéplatz 1, Berlin 10117, Germany;
- Received May 27, 2013
- Revised November 6, 2013
- Accepted November 7, 2013
- First published November 29, 2013.
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