Footnotes

• Handling editor Anna Maria Geretti

• Contributors VS contributed to hypothesis, methodology, data collection, result analysis and manuscript. HC contributed to data collection, result analysis and manuscript. GN contributed to methodology, laboratory supervision and manuscript. SD contributed to hypothesis, methodology, laboratory supervision, result analysis and manuscript. RK supervised the study governance, contributed to methodology, result analysis and 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.

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