RT Journal Article SR Electronic T1 The harms of promoting ‘Zero Harm’ JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 4 OP 6 DO 10.1136/bmjqs-2019-009703 VO 29 IS 1 A1 Eric J Thomas YR 2020 UL http://qualitysafety.bmj.com/content/29/1/4.abstract AB