Marryat L, Wood R, Whittaker A, Frank J, Boardman J. Developing a new cohort of children born to women who used opioids in pregnancy using administrative data: insights into cohort creation and early results. IJPDS [Internet]. 2019 Nov. 22 [cited 2026 Oct. 22];4(3). Available from: https://ijpds.org/index.php/ijpds/article/view/1301