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Age at symptom onset in ankylosing spondylitis: is there a gender difference?

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  • Contributors AC and DS designed the study. All investigators substantially contributed to the acquisition, analysis or interpretation of data. AC wrote the article and all coauthors revised the manuscript critically for important intellectual content. All authors finally approved the version to be published.

  • Funding This study was supported by a grant from the “Stiftung für Rheumaforschung” and by a grant from Abbvie AG. The SCQM Foundation was financially supported by the Swiss Society of Rheumatology, the Balgrist Foundation, the ARCO Foundation and by Abbvie, Bristol-Myers-Squibb, Merck Sharp & Dohme, Pfizer, Roche and UCB. Publication of this article was not contingent upon approval by the study sponsors.

  • Competing interests AC has received consulting and/or speaking fees from Abbvie, Merck Sharp & Dohme, Pfizer and UCB. UW has received honoraria from Abbvie for being a workshop convenor of the International Course of MRI in Spondyloarthritis and for contributing to a slide kit on spondyloarthritis. PE has received speaking fees from Abbvie.

  • Patient consent Obtained.

  • Ethics approval Ethics committee Kanton Zurich.

  • Provenance and peer review Not commissioned; externally peer reviewed.