00584nas a2200181   4500000000100000000000100001008004100002100001100043700001600054700001900070700001300089700001000102700001600112245024200128300001100370490000700381022001400388       2015                            d1 aA. Ali1 aA. Hartzema1 aA. Winterstein1 aR. Segal1 aX. Lu1 aL. Hendeles00aApplication of multicategory exposure marginal structural models to investigate the association between long-acting beta-agonists and prescribing of oral corticosteroids for asthma exacerbations in the Clinical Practice Research Datalink  a260-700 v18  a1098-3015