Drupal-Bibcite31<style face="normal" font="default" size="100%">Comparative effectiveness and safety of direct oral anticoagulants in non-valvular atrial fibrillation: a multi-center observational cohort study</style><style face="normal" font="default" size="100%">Comparative effectiveness and safety of direct oral anticoagulants in non-valvular atrial fibrillation: a multi-center observational cohort study</style>