Evolution of the report of suffering bullying among Brazilian schoolchildren: National Scholl Health Survey - 2009 to 2015 - Mello, Flávia Carvalho Malta; Malta, Deborah Carvalho; Santos, Maria Goreth; Silva, Marta Maria Alves da; Silva, Marta Angélica Iossi (Revista Brasileira de Epidemiologia, 2018)