Endoscopic stag beetle knife treatment for symptomatic Zenker’s diverticulum - Silvino do Monte, Epifanio; Ide, Edson; Sagae, Vitor Massaro Takamatsu; Ribeiro, Igor Braga; Funari, Mateus Pereira; de Oliveira, Pedro Victor Aniz Gomes; de Moura, Eduardo Guimarães Hourneaux (Endoscopy, 2020)