Teaching basic colonoscopy skills: quality and safety standards can be fulfilled in an outpatient university center - Feitosa, Marley Ribeiro; Parra, Rogério Serafim; Freitas, Lucas Fernandes de; Camargo, Hugo Parra de; Rocha, José Joaquim Ribeiro da; Féres, Omar (Arquivos de Gastroenterologia, 2021)