No abstract available
MeSH terms
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Analgesics, Opioid / therapeutic use*
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Chronic Disease
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Dose-Response Relationship, Drug
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Drug Tolerance
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Humans
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Levorphanol / therapeutic use*
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Methadone / therapeutic use
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Neuralgia / drug therapy*
Substances
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Analgesics, Opioid
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Levorphanol
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Methadone