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Contributors AG and AC had full access to all the data used in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. Study concept and design: AG. Acquisition, analysis and interpretation of data: AG and AC. Drafting of the manuscript: AG. Critical revision of the manuscript for important intellectual content: AG and AC. Study supervision: AG.
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.