- Correspondence to Professor Laure Gossec, Hôpital Pitié-Salpétrière, Service de Rhumatologie, 47-83, boulevard de l'Hôpital, Paris 75013, France;
- Received July 30, 2015
- Revised October 7, 2015
- Accepted October 30, 2015
- First published December 7, 2015.
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