Peroral endoscopic myotomy (POEM) as a treatment for pediatric achalasia: Multicenter study and first results Carlos Leganés Villanueva; Eduardo Albéniz Arbizu; Ilaria Goruppi; Nuria Brun Lozano; Federica Bianchi; Alberto Pérez Martínez; Sheyla Montori Pina; Ada Yessenia Molina Caballero; Marianette Murzi; Federico Betroletti; Fermin Estremera; Susana Boronat Guerrero; Carlos Guarner Argente;

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;