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117-9(февраля 2011)6250<m:linebreak></m:linebreak>GR: Canadian Institutes of Health Research/Canada; JID: 101304551; 2010/05/07 received; 2010/09/12 accepted; 2010/08/01 revised; 2010/10/08 aheadofprint; ppublish;<m:linebreak></m:linebreak>Propensity score; Marginal structural models; Introductori.