RT Journal Article SR Electronic T1 Correction: Influence of opioid prescribing standards on health outcomes among patients with long-term opioid use: a longitudinal cohort study JF CMAJ Open JO CMAJ FD Canadian Medical Association SP E926 OP E926 DO 10.9778/cmajo.20210242 VO 9 IS 4 YR 2021 UL http://www.cmajopen.ca/content/9/4/E926.abstract AB