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Broadbear JH, Winger G, Woods JH. Self-administration of fentanyl, cocaine and ketamine: effects on the pituitary-adrenal axis in rhesus monkeys. Psychopharmacology (Berl). 2004 Nov;176(3-4):398–406. doi: 10.1007/s00213-004-1891-x. PMID: 15114434. |