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6The Effect of Novel Opioids on Natural Killer Activity and Tumor Surveillance in Vivo, AIDS, Drugs of Abuse, and the Neuroimmune Axis New Opioids and New Concepts in Their Administration, Advances in Pain Therapy II Establishing Correlations Between the Pharmacodynamic Characteristics of Opioid Agonists and Their Behavioral Effects, Opioids II Neue Opioide und neue Konzepte ihrer Applikation, Zur Behandlung akuter und chronischer Schmerzen The rate-decreasing effects of fentanyl derivatives in pigeons before, during and after chronic morphine treatment, Psychopharmacology Pharmacological profile of a potent, efficacious fentanyl derivative in rhesus monkeys, Psychopharmacology