Analysis of control arms in oncology randomised trials in Brazil: a cross-sectional study by Ana Elisa Boracini Sanches, Luiza Aleixo Barros Leite Fadul, Debora Aparecida Pires de Campos Zuccari, Beatriz de Menezes Dobbert, Lorena Forner, Júlia Belone Lopes, Daniel Vilarim Araujo

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