Drupal-Bibcite31<style face="normal" font="default" size="100%">Effects of Pulmonary Rehabilitation on Exacerbation Number and Severity in People With COPD: An Historical Cohort Study Using Electronic Health Records</style><style face="normal" font="default" size="100%">Effects of Pulmonary Rehabilitation on Exacerbation Number and Severity in People With COPD: An Historical Cohort Study Using Electronic Health Records</style>