Drupal-Bibcite31<style face="normal" font="default" size="100%">Variability of antibiotic prescribing in patients with chronic obstructive pulmonary disease exacerbations: a cohort study</style><style face="normal" font="default" size="100%">Variability of antibiotic prescribing in patients with chronic obstructive pulmonary disease exacerbations: a cohort study</style>