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Contributors PP has conceived, written the first draft, re-edited, finally approved and submitted the manuscript. SR has read and edited the first draft, added further arguments, re-read and finally approved 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 consent Not required.
Provenance and peer review Commissioned; internally peer reviewed.