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Handling editor Josef S Smolen
Contributors All authors have contributed to the conception and design of the work, the acquisition and interpretation of data. All authors revised it critically for important intellectual content and gave final approval of the version published. They agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Funding This work was supported by an unrestricted educational grant from AbbVie Deutschland GmbH to the Rheumazentrum Erlangen, Germany.
Competing interests None declared.
Patient and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Commissioned; externally peer reviewed.