HIV, HBV, HCV and Syphilis infections with related transmission among drug users, particulary crack-cocaine abusers, in Sao Paulo-Brazil: analysis of morbidity and risk factors - Seibel, S. D.; Carvalho, Heraclito Barbosa de; Santos, V. A.; Saconi, R. A.; Finianos, A. B.; Burattini, Marcelo Nascimento; Massad, Eduardo (Oporto Regional Meeting/The heritage of the XXth century in the area of Neuropsychopharmacology, 2000)