RT Journal Article SR Electronic T1 Measuring safety of healthcare: an exercise in futility? JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 341 OP 344 DO 10.1136/bmjqs-2019-009824 VO 29 IS 4 A1 Khara Sauro A1 William A Ghali A1 Henry Thomas Stelfox YR 2020 UL http://qualitysafety.bmj.com/content/29/4/341.abstract AB