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Contributors MD and MSK had full access to all the data in the study; take responsibility for the integrity of the data and the accuracy of the data analysis and contributed to the study concept, design, acquisition, analysis and interpretation of data. VH drafted the manuscript. MSK contributed to the critical revision of the manuscript for important intellectual content.
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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