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Tip-cutting endoscopic submucosal dissection (ESD) knives. (A) Hook knife (Olympus, Tokyo, Japan). (B) Flex knife (Olympus, Tokyo, Japan). (C) Dual knife (Olympus, Tokyo, Japan). (D) Flush knife BT (Fujifilm, Tokyo, Japan). (E) Hybrid knife (ERBE, Erlangen, Germany).
