HydrocodoneHydromorphoneOxycodoneCodeineAnalgesics, OpioidOxymorphoneObstetric Surgical ProceduresSubstance Abuse DetectionNarcoticsMorphine DerivativesOpioid-Related DisordersMorphineMiosisAntitussive AgentsCytochrome P-450 CYP2D6Gas Chromatography-Mass SpectrometryAcetaminophenPain, PostoperativePain