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Kemp SV, El Batrawy SH, Harrison RN, et al. Learning curves for endobronchial ultrasound using cusum analysis. Thorax 2010;65:534–8. doi:10.1136/thx.2009.127274. This paper has a formula incorrectly specified. The formula for Q on page 535 which reads Q=ln((1−p1)/(1−p0)) should read: Q=ln((1−p0)/(1−p1)).2