RT Journal Article SR Electronic T1 Principles of effective altruism and ethical implications for physicians JF BMJ Leader JO BMJ Leader FD BMJ Publishing Group Ltd SP 186 OP 187 DO 10.1136/leader-2021-000482 VO 5 IS 3 A1 Ellery Altshuler YR 2021 UL http://bmjleader.bmj.com/content/5/3/186.abstract AB