%0 Journal Article %A Steve Goodacre %T Uncontrolled before-after studies: discouraged by Cochrane and the EMJ %D 2015 %R 10.1136/emermed-2015-204761 %J Emergency Medicine Journal %P 507-508 %V 32 %N 7 %U https://emj.bmj.com/content/emermed/32/7/507.full.pdf