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Dr Daly's principlist defence of multiple heart valve replacements for continuing opiate users: the importance of Aristotle’s formal principle of justice

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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

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