See also: Commentaire de travail de H. Inoue et al., pp. 265 Endoscopy 2010; 42(04): 350-350 DOI: 10.1055/s-0031-1291851 Referred to by: Peroral endoscopic myotomy (POEM) opens the door of third-space endoscopy Endoscopy 2019; 51(11): 1010-1012 DOI: 10.1055/a-1019-1865 Background: Peroral endoscopic...