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Contributors AX: study design, data collection, statistical analysis and manuscript preparation. She is guarantor. RH: study design, data analysis and manuscript preparation. LF: data collection and manuscript preparation. COT: data analysis and manuscript preparation.
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.