Footnotes

• Twitter @clifford0584, @hirstposition

• Contributors TAGS coordinated, drafted and edited the manuscript with equal contributions to the summaries and final manuscript by LC, DD, RH, MN, GO and GP.

• 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; internally peer reviewed.