No abstract available
MeSH terms
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Analgesics, Opioid / therapeutic use*
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Carcinoma / complications*
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Humans
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Male
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Methadone / therapeutic use*
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Middle Aged
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Pain / drug therapy*
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Pain / etiology*
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Rectal Neoplasms / complications*
Substances
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Analgesics, Opioid
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Methadone