TY - STAND AU - D. Lewer AU - P. Padmanathan AU - Qummer Arfeen AU - S. Denaxas AU - H. Forbes AU - A. Gonzalez-Izquierdo AU - M. Hickman BT - Wellcome Open Res DO - 10.12688/wellcomeopenres.16431.1 PY - 2020 EP - 282 T2 - Wellcome Open Res TI - Healthcare use by people who use illicit opioids (HUPIO): development of a cohort based on electronic primary care records in England VL - 5 SN - 2398-502X (Print) 2398-502x ER -