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Contributors SA, FP, RG and FMM gave substantial contributions to the study, including designing and drafting the manuscript. M-GS and EB reviewed the manuscript and gave final approval of the version to be published.
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.
Patient consent Parental/guardian consent obtained.
Provenance and peer review Not commissioned; externally peer reviewed.