Victims, bullies and bully-victims: prevalence and association with negative health outcomes from a cross-sectional study in Sao Paulo, Brazil - Loch, Ana Paula; Astolfi, Roberta Corradi; Leite, Maria Alvim; Papa, Cassio Henrique Gomide; Ryngelblum, Marcelo; Eisner, Manuel; Peres, Maria Fernanda Tourinho (International journal of public health, 2020)