Yu J, Zhou H, Liu X, Zou F, Willke RJ. Adjusting Complex Heterogeneity in Treatment Assignment in Observational Studies. ijsmr [Internet]. 2014 May 14 [cited 2024 Nov. 24];3(2):203-14. Available from: https://lifescienceglobal.com/pms/index.php/ijsmr/article/view/1966