Footnotes

• Contributors AG: bronchoscopist., writing and technical editing of the manuscript. CL: review of the images proposed in the article and participant in the writing process. MG: critically reviewed the study proposal.

• 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.