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Contributors Conception and design of the study: FM, RS, PA, ER, PL, SN. Acquisition and analysis of data: FM, CD, VC, JF, FCD, EE, NF, SL, SL, RS, PA, ER, PL, SN. Drafting a significant portion of the manuscript or figures: FM, CD, VC, SN.
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 Not required.
Provenance and peer review Not commissioned; externally peer reviewed.
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