RT Journal Article SR Electronic T1 Dr Daly's principlist defence of multiple heart valve replacements for continuing opiate users: the importance of Aristotle’s formal principle of justice JF Journal of Medical Ethics JO J Med Ethics FD BMJ Publishing Group Ltd and Institute of Medical Ethics SP 651 OP 652 DO 10.1136/jme-2022-108588 VO 48 IS 10 A1 Raanan Gillon YR 2022 UL http://jme.bmj.com/content/48/10/651.abstract AB