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Contributors All the authors have given substantial contribution to: conception and design, or analysis and interpretation of data, drafting the article or revising it critically for important intellectual content, final approval of the version to be published.
Competing interests ICMJE conflicts of interest for each author of this manuscript has been uploaded.
Ethics approval Provided by the Ethics committee of Rheumatism Foundation Hospital, Heinola, Finland.
Provenance and peer review Not commissioned; externally peer reviewed.
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