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Diurnal variation of power Doppler in metacarpophalangeal joints of patients with rheumatoid arthritis: a preliminary study

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  • GF and EF contributed equally to this work. M-CB and WG contributed equally to this work.

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the Comité de Protection des Personnes Île-de-France, Hôpital Robert Ballanger. Aulnay Sous Bois, France. Comitato Etico dell' Azienda Sanitaria Unica Regionale di Ancona, Italy.

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

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