00340nas a2200109   4500000000100000008004100001100001200042700001400054700001200068245013600080022001400216       2021                            d1 aT. Chen1 aR. Knaggs1 aL. Chen00aAssociation between opioid-related deaths and persistent opioid prescribing in primary care in England: a nested case-control study  a0306-5251