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Novel approach to training novices in endoscopic submucosal dissection: The Master‐Apprentice Technique

ENDOSCOPIC SUBMUCOSAL DISSECTION (ESD) is difficult for novice endoscopists. In conventional ESD, the operator controls advancing and withdrawing the tip of the device with the right hand, while the scope is controlled with the left hand. The second operator opens and closes the tip (Fig. 1). When a novice endoscopist is the operator, simultaneously controlling the endoscope and device becomes difficult and may cause erroneous