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Contributors Both authors contributed to developing arguments, research, writing and editing.
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.
Provenance and peer review Not commissioned; internally peer reviewed.
Correction notice This article has been corrected since it was published. G. Owen Schaefer was originally listed incorrectly as G. Owen Scaefer
Patient consent for publication Not required.