Bacterial keratitis in a tertiary hospital in São Paulo: a 21-year review of the epidemiological, laboratory, and clinical data Beatriz Avila Zaccaron; Maria Emilia Xavier dos Santos Araújo; Alexandre Inácio Cruz de Paula; Bruno de Mendonça Costa; Emellyne Pamela Diniz Pires Papalini; Roberta Arb Saba Rodrigues Pinto;