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Control chart for the number of blood cultures per 100 patient-days displaying cultures from January 2015 to December 2018. Three time periods are preintervention (January 2015–October 2016), intervention (November 2016–July 2018), and follow-up (July–December 2018). Interventions are highlighted in the figure (^ = algorithm introduction, ^^ = educational intervention, ^^^ = feedback intervention).
