Drug consumption among medical students in São Paulo, Brazil: influences of gender and academic year. - De Oliveira, Lúcio Garcia; Barroso, Lúcia Pereira; Wagner, Gabriela Arantes; De Carvalho Ponce, Júlio; Malbergier, André; De Andrade Stempliuk, Vladimir; De Andrade, Arthur Guerra (Brazilian Journal of Psychiatry / Revista Brasileira de Psiquiatria, 2009)