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The power Doppler twinkling artefact associated with periarticular calcification induced by intra-articular corticosteroid injection in patients with rheumatoid arthritis

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  • Contributors YN, SS, YS: manuscript preparation, acquisition and interpretation of data; TK, YI, KM: patients treatment and acquisition of data; TI, HI, KF, KY: supervision of manuscript.

  • Competing interests None.

  • Patient consent Obtained.

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

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