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Patient selection for the case series and the case-control group, both with RA and unexplained local pain in the knee, ankle, or foot. In total, 1,624 unique patients with RA were treated in the clinic during 2010–2017. The lower two boxes define the case series and the case-control group. MRI ankle includes foot.
RA: rheumatoid arthritis; MRI: magnetic resonance imaging.
