- Correspondence to Dr Laure Gossec, Service de Rhumatologie, Hôpital Pitié-Salpétrière, 47-83, boulevard de l'Hôpital, Paris 75013, France;
- Received January 8, 2014
- Revised April 1, 2014
- Accepted April 2, 2014
- First published April 30, 2014.
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