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Handling editor Josef S Smolen
Contributors SB, CM-R, RS and XM designed the study. All authors acquired the data. SB, CM-R, RS, XM, PAJ, CV and PD analysed the data. All authors gave final approval to the paper.
Funding This study was funded by Pfizer (10.13039/100004319) and grant number: Passerelle.
Competing interests None declared.
Patient consent Not required.
Ethics approval This study was approved by the local institutional review board named CPP Île de France VII under number PP 12-030.
Provenance and peer review Not commissioned; externally peer reviewed.
Presented at This work has already been presented at the European League Against Rheumatism and published as a conference abstract .
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