- Correspondence to Boulos Haraoui, Institut de Rhumatologie de Montreal, 1551 Ontario Street East, Montreal, Quebec, Canada H2L 1S6;
- Received September 15, 2014
- Revised December 15, 2014
- Accepted December 16, 2014
- First published January 5, 2015.
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- Data supplement 1 - Online supplement
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