TY - STAND AU - A. Ali AU - A. Hartzema AU - A. Winterstein AU - R. Segal AU - X. Lu AU - L. Hendeles BT - Value Health DO - 10.1016/j.jval.2014.11.007 M1 - 2 PY - 2015 SP - 260 EP - 70 T2 - Value Health TI - Application 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 VL - 18 SN - 1098-3015 ER -