DOĞANAY, Güler; EKMEKÇI, Perihan; KAZBEK, Baturay Kansu; YILMAZ, Hakan; ERKAN, Gülbanu; TÜZÜNER, Filiz. Effects of alfentanil or fentanyl added to propofol for sedation in colonoscopy on cognitive functions: Randomized controlled trial. Turkish Journal of Gastroenterology, [S. l.], v. 28, n. 6, p. 453–459, 2017. DOI: 10.5152/tjg.2017.16489. Disponível em: https://www.turkjgastroenterol.org/index.php/tjg/article/view/3130. Acesso em: 1 jan. 2026.