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Patients with early arthritis who fulfil the 1987 ACR classification criteria for rheumatoid arthritis but not the 2010 ACR/EULAR criteria

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  • Funding This study was supported by a grant from the Korea Healthcare Technology R&D project, Ministry of Health and Welfare, Republic of Korea (A102065).

  • Competing interests None.

  • Ethics approval This study was approved by the Institutional Review Board of Severance Hospital, Yonsei University Health System, Seoul, Korea.

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

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