Footnotes

• Handling editor Iskander Chaudhry.

• Twitter @QassidO

• Contributors MH, OLQ, RLJ, SZ, CF and KT co-wrote the manuscript. MH and KT selected and photographed images.

• 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.

• Patient consent for publication Not required.

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