RT Journal Article SR Electronic T1 Trends in adverse events over time: why are we not improving? JF BMJ Quality & Safety JO BMJ Qual Saf FD BMJ Publishing Group Ltd SP 273 OP 277 DO 10.1136/bmjqs-2013-001935 VO 22 IS 4 A1 Kaveh G Shojania A1 Eric J Thomas YR 2013 UL http://qualitysafety.bmj.com/content/22/4/273.abstract AB