No abstract available
MeSH terms
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Administration, Mucosal
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Analgesics, Opioid / administration & dosage*
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Analgesics, Opioid / blood
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Analgesics, Opioid / therapeutic use
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Drug Tolerance*
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Fentanyl / administration & dosage*
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Fentanyl / blood
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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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Substance-Related Disorders / drug therapy
Substances
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Analgesics, Opioid
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Methadone
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Fentanyl