Marryat, Louise, Rachael Wood, Anne Whittaker, John Frank, and James Boardman. 2019. “Developing a New Cohort of Children Born to Women Who Used Opioids in Pregnancy Using Administrative Data: Insights into Cohort Creation and Early Results”. International Journal of Population Data Science 4 (3). https://doi.org/10.23889/ijpds.v4i3.1301.