Footnotes

• Contributors LL, AMB and GA developed the study concept and design. All authors contributed to the writing, provided feedback and revised critically 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.

• Patient consent Not required.

• Ethics approval Liverpool John Moores University.

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