Footnotes

• Contributors MdCF contributed to the acquisition, analysis and interpretation of data, writing and manuscript review. TB contributed to the acquisition, analysis and interpretation of data, writing and manuscript review. DPN contributed to the study design, acquisition, analysis and interpretation of data, writing and manuscript review. TKDO contributed to the analysis and interpretation of data and manuscript review. GdPB contributed to the analysis and interpretation of data, writing and manuscript review. AdMK contributed to the analysis and interpretation of data, writing and manuscript review. CSVB contributed to the analysis and interpretation of data, writing and manuscript review. LOM contributed to the acquisition, analysis and interpretation of data, writing and manuscript review. SFB contributed to the acquisition, analysis and interpretation of data, writing and manuscript review. JK contributed to the acquisition, analysis and interpretation of data, writing and manuscript review. AKS contributed to the analysis and interpretation of data and manuscript review. DE contributed to the study design, acquisition, analysis and interpretation of data, writing and manuscript review. All authors approved the final version of the article.

• 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.