1.
Blackburn R, Wijlaars L, Harron K, Guttmann A, Gilbert R. Maternal mortality of women with opioid-use during pregnancy in England: investigating bias in a cohort of linked mother-baby hospital records. IJPDS [Internet]. 2018 Sept. 5 [cited 2026 Oct. 24];3(4). Available from: https://ijpds.org/index.php/ijpds/article/view/895