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Difficulties making a fist in clinically suspect arthralgia: an easy applicable phenomenon predictive for RA that is related to flexor tenosynovitis

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  • EN and AHMvdH-vM are joint senior authors.

  • Handling editor Josef S Smolen

  • Contributors FW, FJvdG, EN and AHMvdH-vM developed the study concept and design. FW and XMEM contributed to the data acquisition. FW performed data analyses. FW, EN and AHMvdH-vM wrote the first version of the manuscript. All authors critically reviewed the paper and approved the final manuscript.

  • Funding This work was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Starting grant, agreement No. 714312) and the Dutch Arthritis Society.

  • Competing interests None declared.

  • Patient consent for publication Obtained.

  • Ethics approval Ethical approval is provided by a Local Medical Ethics Committee, named ‘Commissie Medische Ethiek’.

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

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