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Contributors SA and EG gave substantial contributions to study conception and design. All authors gave substantial contributions to acquisition of data. SA, AC, MG, BT, MF and EG gave substantial contributions to analysis and interpretation of data. SA, AC, BT and EG drafted the article and revised it critically for important intellectual content. All authors gave final approval of the version of the article to be published.
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.
Provenance and peer review Not commissioned; internally peer reviewed.