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The novel versatile knife (Optimos knife; Taewoong Medical) used in this study. (A) The Optimos knife has a 1.9-mm-wide and 2.5-mm-long anchor-shaped tip, which can be smoothly and fully rotated by controlling the dial on the handle of the knife. (B) The outer sheath can perform the water injection function. (C) The handle of the knife.
