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SV Kemp, SH El Batrawy, RN Harrison, et al. Learning curves for endobronchial ultrasound using cusum analysis. Thorax 2010;65:534–8. doi:10.1136/thoraxjnl-2009-127274
SH El Batrawy's affiliation is to read: Respiratory Medicine Department, Ain Shams University, Cairo, Egypt.