Footnotes

• Contributors EHS, ES and KS have substantially contributed and are primarily responsible of drafting the work and revising the manuscript. LE, ML, MF and JK have supported the drafting of the work and revising it critically for important intellectual content.

• 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; externally peer reviewed.