<style face="normal" font="default" size="100%">The positivity assumption and marginal structural models: the example of warfarin use and risk of bleeding</style>

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31<style face="normal" font="default" size="100%">The positivity assumption and marginal structural models: the example of warfarin use and risk of bleeding</style><style face="normal" font="default" size="100%">The positivity assumption and marginal structural models: the example of warfarin use and risk of bleeding</style>