Analgesic effects in human subjects of morphine, meperidina and methadon.
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D000700:Analgesics; D006801:Humans; D008614:Meperidine; D008691:Methadone; D009020:Morphine; D009022:Morphine Derivatives
D000700:Analgesics; D009022:Morphine Derivatives; D009020:Morphine; D008614:Meperidine; D008691:Methadone