- Correspondence to Professor Laure Gossec, Department of rheumatology, Hôpital Pitié-Salpétrière, Pavillon Benjamin Delessert 2e étage, 47-83, boulevard de l'Hôpital, Paris 75013, France;
- Received July 15, 2015
- Revised September 16, 2015
- Accepted October 4, 2015
- First published October 22, 2015.
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