00409nas a2200145   4500000000100000000000100001008004100002100001500043700002100058700001400079245014100093300000800234490000700242022001400249       2009                            d1 aJ. Delaney1 aS. Daskalopoulou1 aS. Suissa00aTraditional versus marginal structural models to estimate the effectiveness of beta-blocker use on mortality after myocardial infarction  a1-60 v18  a1053-8569