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[Correspondence] Radial versus femoral access for cardiac catheterisation – Authors’ reply

We thank Cameron Dowling and colleagues, David Brieger and Andy Yong, and Rahman Shah and Jonathan D Gardner for their interest in our study.1 We agree that MATRIX requested a fairly robust radial expertise for operators to qualify, with at least 75 radial interventions in the year before the start of the study and at least 50% of these interventions in patients with acute coronary syndrome. By contrast, the RIVAL trial2 requested operators to have done a minimum of 50 radial catheterisations overall to participate.

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