%0 Journal Article %A Philip Levitt %T Challenging the systems approach: why adverse event rates are not improving %D 2014 %R 10.1136/bmjqs-2014-003569 %J BMJ Quality & Safety %P 1051-1052 %V 23 %N 12 %U https://qualitysafety.bmj.com/content/qhc/23/12/1051.full.pdf