HIV and infections with related transmission in drug users of Brazil, particularly of crack abusers: analisys of morbidity and risk factors in behavior - Carvalho, Heraclito Barbosa de; Seibel, S.; Santos, V.; Saconi, R.; Burattini, Marcelo Nascimento; Massad, Eduardo; Finianos, A. (International AIDS Conference, XIII, 2000)