Safety of levofloxacin as an antibiotic prophylaxis in the induction phase of children newly diagnosed with acute lymphoblastic leukemia: an interim analysis of a randomized, open-label trial in Brazil Mauro Cesar Dufrayer; Ciliana Rechenmacher; Clarice Franco Meneses; Yasmine Massaro Carneiro Monteiro; Fabianne Altruda de Moraes Costa Carlesse; Fabrizio Motta; Liane Esteves Daudt; Mariana Bohns Michalowski;