00528nas a2200181   4500000000100000008004100001100001300042700001900055700001800074700001500092700001400107700002600121700001500147245013800162300000800300490000600308022003200314       2020                            d1 aD. Lewer1 aP. Padmanathan1 aQummer Arfeen1 aS. Denaxas1 aH. Forbes1 aA. Gonzalez-Izquierdo1 aM. Hickman00aHealthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England  a2820 v5  a2398-502X (Print) 2398-502x