No abstract available
MeSH terms
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Analgesics, Opioid / administration & dosage*
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Female
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Humans
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Meperidine / administration & dosage*
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Morphine / administration & dosage*
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Obstetric Labor Complications / prevention & control*
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Pain Measurement*
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Pregnancy
Substances
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Analgesics, Opioid
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Morphine
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Meperidine