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Contributors Study conception and design: AA, ST, MC. Acquisition of data: AA, ST, MC. Analysis and interpretation of data: FA. Drafting of the manuscript: AA, ST, MC. Critical revision: AA, FA.
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 for publication Obtained.
Provenance and peer review Not commissioned; externally peer reviewed.