Endoscopic submucosal dissection for a duodenal polyp at the upper aspect of the duodenal bulb using a newly developed endoscope by Satoki Shichijo, MD, PhD, Yushi Kawakami, MD, Atusko Kizawa, MD, Daiki Kitagawa, MD, Yasuhiro Tani, MD, Yoji Takeuchi, MD, PhD, Ryu Ishihara, MD, PhD

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