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Funding The author has not received any 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 Commissioned; internally peer reviewed.
↵What they call the four traditional theories of justice based on utilitarianism, libertarianism, communitarianism and egalitarianism, along with more recent capability theories and well-being theories—see ref 2, pp 270–281