HydrocodoneHydromorphoneOxycodoneCodeineOxymorphoneObstetric Surgical ProceduresAnalgesics, OpioidSubstance Abuse DetectionMorphine DerivativesNarcoticsAntitussive AgentsOpioid-Related DisordersBehavior, AddictiveMiosisCytochrome P-450 CYP2D6Gas Chromatography-Mass SpectrometryAcetaminophenSubstance-Related DisordersMorphine