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Contributors CP conceived the idea, drafted the manuscript and revised the final version of the manuscript. EB, GC and RC revised the manuscript and approved the final version of the manuscript. RG conceived the idea and wrote the manuscript.
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.