Tips and tricks in the endoscopic management of a complex biliary stone in Billroth II gastrectomy - de Oliveira, Guilherme Henrique Peixoto; de Moura, Diogo Turiani Hourneaux; McCarty, Thomas R.; de Oliveira, Pedro Victor Aniz Gomes; Funari, Mateus Pereira; Cheng, Spencer; de Moura, Eduardo Guimarães Hourneaux (Endoscopy, 2021)