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Contributors Each author listed on the manuscript has seen and approved the submission of this version of the manuscript and takes full responsibility for the manuscript. VG: project development, data collection and management, manuscript writing. SS: data collection. GG: data collection. EB: project development, manuscript editing.
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; internally peer reviewed.
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