Righetti Ana Elisa Moraes, Jacomini Cristiane, Parra Rogerio Serafim, de Almeida Ana Luiza Normanha Ribeiro, Rocha José Joaquim Ribeiro, Féres Omar
Division of Coloproctology, Department of Surgery and Anatomy, School of Medicine, University of São Paulo, Ribeirão Preto, SP, Brazil.
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