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Footnotes
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Contributors IM: participated in data acquisition, analysis and interpretation; drafting, revision and final approval of the manuscript; CH: participated in data acquisition; drafting, revision and final approval of the manuscript; AK: participated in data acquisition; drafting, revision and final approval of the manuscript; EH participated in study conception, design and supervision; data analysis and interpretation; drafting, revision and final approval of the report; DV: participated in study conception, design and supervision; data acquisition, analysis and interpretation; and drafting, revision and final approval of the report.
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Funding This research is funded by the Hellenic Society for Rheumatology, Special Account for Research Grants (SARG), National and Kapodistrian University of Athens, Athens, Greece.
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Competing interests None.
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Ethics approval Institutional Review Board.
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Provenance and peer review Not commissioned; externally peer reviewed.