Attempted Endoscopic En Bloc Resection of Mucosal and Submucosal Tumors Using Insulated-Tip Knives: A Pilot Series (including videos) - Rösch, T; Sarbia, M; Schumacher, B; Deinert, K; Frimberger, E; Toermer, T; Stolte, M; Neuhaus, H (Endoscopy, 2004)