title: Prenatal opioid exposure and the problem of causal inference.
mesh_terms: D000818:Animals; D002657:Child Development / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D005260:Female; D005333:Fetus / Q000187:drug effects*; D006801:Humans; D007700:Kinetics; D008691:Methadone / Q000378:metabolism / Q000633:toxicity; D009294:Narcotics / Q000633:toxicity*; D011247:Pregnancy
chemical_list: D009294:Narcotics; D008691:Methadone