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We thank Hochhegger, Irion and Marchiorifor1 their interest in our manuscript.2 We agree that cumulative radiation dose exposures from chest computed tomography (CT) could be a limiting factor for the use of frequent scans in children with cystic fibrosis, although continuous advances in CT technology are allowing comprehensive assessments of lung structure with increasingly smaller radiation exposures.3 …
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Competing interests None.
Provenance and peer review Not commissioned; internally peer reviewed.