The “double string” sign: a warning image after cold endoscopic mucosal resection - Nogales Rincón, Óscar; García García, Julia; Ortega Lobete, Olga; Carbonell Blanco, Carlos; Rayón Moreno, Laura; Aranda Hernández, Javier; Merino Rodríguez, Beatriz (Endoscopy, 2020)