%0 Journal Article %A P Ernst %T Long acting beta 2 agonists and the risk of life threatening asthma. %D 1998 %R 10.1136/thx.53.1.1 %J Thorax %P 1-2 %V 53 %N 1 %U https://thorax.bmj.com/content/thoraxjnl/53/1/1.full.pdf