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Subjects
- Narcotics -- adverse effects[remove]3
- Analgesics, Opioid -- adverse effects1
- Anesthesia, Obstetrical -- adverse effects1
- Dose-Response Relationship, Drug1
- Fetus -- drug effects1
- Hydromorphone -- adverse effects1
- Infant, Newborn1
- Medication Errors -- prevention & control1
- Morphine -- adverse effects1
- Obstetric Labor Complications -- chemically induced1
- Parturition1
- Seizures1
- United States1