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  • Contributors PT devised the plan for the article and obtained patient consent. PT was the lead author in the writing of the manuscript. AW selected the appropriate images from the CT file. AW devised the style of the question and answers. LR edited the draft of the article and aided in the writing of the manuscript.

  • Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; externally peer reviewed.