Timing of endoscopy in high-risk patients with acute upper gastrointestinal bleeding: Results of a multicenter international cohort study Javier Tejedor-Tejada; Benito Hermida; Cristina Camblor; Mohamed Emara; Salem Youssef Mohamed; Jose M. Perez-Pariente;

Exploring the utility of cellular indices in the diagnosis of ulcerative colitis Julio César Moreno Alfonso; Sharom Barbosa-Velásquez; Carlos Delgado-Miguel; Ada Molina Caballero; Sara Hernández-Martín; Alberto Pérez Martínez; María Concepción Yárnoz Irazábal;

Clinical outcomes and manometry results of peroral endoscopic myotomy in patients with achalasia: experience in a Latin American referral centre Angélica Tobón; Gustavo Rafael Cantillo Nassar; Albis Cecilia Hani; Nancy Muriel Herrera Leaño; Cristiam Pulgarin; Oscar Mauricio Muñoz;