%0 Journal Article %A John B Chambers %T Aortic stenosis: service delivery before guidelines %D 2019 %R 10.1136/heartjnl-2019-315606 %J Heart %P 1686-1687 %V 105 %N 22 %U https://heart.bmj.com/content/heartjnl/105/22/1686.full.pdf