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[Correspondence] Ureteric colic and clinical evidence – Authors’ reply

We thank Luca Villa and colleagues for their interest in our Article on the SUSPEND trial.1 They raise concerns with respect to confounding by the possible presence of a dilated urinary collecting system above the stone, and the appropriateness of our primary outcome measure. Dilatation of the collecting system is widespread in patients presenting with a ureteric stone. In the few patients who also have uncontrolled pain, sepsis, or impaired renal function, urgent intervention is indicated and this factor was an exclusion criterion for our study.