Footnotes

• Contributors MM, HM and CdH designed the study. MM, AAvdE, CHG, HM and CdH were involved in the execution of the study. MM, CHG and CdH accessed and verified the underlying data. MM and NE analysed the data. MM wrote the manuscript with input from all other authors. All authors participated in data interpretation, manuscript writing, review and approval of the final version of the manuscript for submission.

• 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.

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