Affiliation: | Department of Gastroenterology, University of Sao Paulo, São Paulo 05403-000, São Paulo, Brazil. moc.liamtoh@2142srpjch;Department of Gastrointestinal Endoscopy Service, Hospital 9 de Julho, São Paulo 01409002, São Paulo, Brazil;Department of Gastroinestinal, Catholic University of Cuenca, Cuenca 010101, Ecuador;Department of General Surgery, Servidor Municipal Hospital, São Paulo 01532-001, Brazil |