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The requested URL /translate_c?depth=1&hl=ro&rurl=translate.google.ro&sl=en&sp=nmt4&tl=ro&u=https://scholar.google.com/scholar_lookup%3Fjournal%3DJ%2BAm%2BStat%2BAssoc%26title%3DMarginal%2Bstructural%2Bmodels%2Bto%2Bestimate%2Bthe%2Bjoint%2Bcausal%2Beffect%2Bof%2Bnonrandomized%2Btreatments%26author%3DMA%2BHernan%26author%3DB%2BBrumback%26author%3DJM%2BRobins%26volume%3D96%26publication_year%3D2001%26pages%3D440-448%26&xid=17259,15700022,15700186,15700190,15700256,15700259,15700262&usg=ALkJrhhnNlINVoGyWWJniPBPfNFnfSIgFw was not found on this server. That’s all we know.