Drupal-Bibcite31<style face="normal" font="default" size="100%">Outcomes Associated with Treatment of Chronic Pain with Tapentadol Compared with Morphine and Oxycodone: A UK Primary Care Observational Study</style><style face="normal" font="default" size="100%">Outcomes Associated with Treatment of Chronic Pain with Tapentadol Compared with Morphine and Oxycodone: A UK Primary Care Observational Study</style>