Footnotes

• RI and HC are joint first authors.

• RI and HC contributed equally.

• Contributors HC and RI are leading first authors with equal contributions. HC is the corresponding author. AC is the senior author of the manuscript. HC and RI are involved in the planning, conducting, reporting, conception and design of the manuscript. All authors contributed to the writing of 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.

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