Footnotes

• Handling editor Murali Varma.

• Contributors - Contributorship Statement - All authors have made substantial contributions to the intellectual content of this article. JM – creation of manuscript. JO – creation and editing of manuscript. BK

  – editing of manuscript. DM – creative process and editing of manuscript. NL – editing and creative process of manuscript. RE – creative process, editing and surgical management. CM –

  creative process, overall direction of paper, editing of 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.