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Contributors FC, SN, GT and EM made substantial contributions to the conception or design of the work, or the acquisition, analysis or interpretation of data; participated in drafting the work and revising it critically for important intellectual content; gave final approval for the published version and agreed to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.
Competing interests None declared.
Provenance and peer review Commissioned; internally peer reviewed.