A balloon‐assisted endoscopic submucosal dissection using long colonoscope and guidewire by Yu Watahiki, Kazumasa Kawashima, Takuto Hikichi, Tadayuki Takagi, Michio Onizawa, Naohiko Gunji, Chiharu Watanabe, Jun Wada, Yuka Oka, Yuko Hashimoto, Hiromasa Ohira

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