Differences in social demographic pattern and risky behavior of brazilian idus - Bueno, Regina; Burattini, Marcelo Nascimento; Turienzo, G.; Carvalho, H. B.; Mesquita, F.; Andrade, T.; Bastos, F. I.; Seibel, S.; Massad, Eduardo; Azevedo Neto, Raymundo Soares de (International Conference on The Reduction of Drug Related Harm, 1997)