- Correspondence to Professor Laure Gossec, Hôpital Pitié-Salpétrière, Service de Rhumatologie, 47-83, boulevard de l'Hôpital, Paris 75013, France;
- Received September 14, 2015
- Revised December 4, 2015
- Accepted January 16, 2016
- First published February 4, 2016.
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- Data supplement 1 - Online supplement
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