Clinical outcomes and risk factors for local residual/recurrent tumors after endoscopic submucosal dissection including major papilla for laterally spreading ampullary tumors - Naohisa Yahagi; Teppei Akimoto; Yusaku Takatori; Motoki Sasaki; Kurato Miyazaki; Atsuto Kayashima; Teppei Masunaga; Kumiko Kirita; Mari Mizutani; Hiroki Tamagawa; Shintaro Kawasaki; Takashi Seino; et al. (Endoscopy, 2026)