<style face="normal" font="default" size="100%">Healthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England</style>

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31<style face="normal" font="default" size="100%">Healthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England</style><style face="normal" font="default" size="100%">Healthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England</style>