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Contributors All authors participated in the interpretation and analysis of data, and in drafting and critical revision of the work. All authors approved the final version of the manuscript. LC, NG, AdP, RS and FC: contributed to study conception and/or design of the work. MT, NS, EM and FF: contributed to the acquisition of data.
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 and public involvement Patients and/or the public were not involved in the design, or conduct, or reporting, or dissemination plans of this research.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.