Blanco Avellaneda C de J, Barreto-Guevara MI, Walteros-Gordillo YL, Pinzón-Segura NA, Rivera-Velasco M del C, Bareño-Silva J. Cohorts of premedication for endoscopy of the upper gastrointestinal tract with simethicone, N-acetylcysteine, Hedera helix and visual scale validation. Rev. colomb. Gastroenterol. [Internet]. 2021 Mar. 8 [cited 2024 May 17];36(1):39-50. Available from: https://www.revistagastrocol.com/index.php/rcg/article/view/582