Effects of repeated treatment with morphine on oxidative burst and phagocytosis by macrophages: a flow cytometry study - Rodrigues Costa, E. C; Carvalho-Freitas, Maria Isabel Roth de; Stankevicius, Daniel; Palermo-Neto, João; Felicio, Luciano Freitas (Congresso Iberoamericano de Neuroimunomodulação, 2005)