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Kreek MJ, Eisenstein T, Friedman H, Peterson P, Soderberg L, Brown LS, Rogers TJ, Bussiere JL, Rojhavin M, Szabo I, Meissler JJ, Belkowski SM, Geller EB, Adler MW, Molitor T, Chao C. Drugs of abuse and immunosuppression. NIDA Research Monograph Series. 1994. p. 89–93.