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Suggested algorithm for endoscopic resection (ER) of undifferentiated-type early gastric cancer (UD-EGC) based on previous studies (Modified from Kim [39]). PD, poorly differentiated adenocarcinoma; SRC, signet ring cell carcinoma; EUS, endoscopic ultrasonography; IM, intestinal metaplasia; NBI-ME, narrow-band imaging with magnifying endoscopy.
