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Ono H, Yao K, Fujishiro M et al. Guidelines for endoscopic submucosal dissection and endoscopic mucosal resection for early gastric cancer. Digestive endoscopy : official journal of the Japan Gastroenterological Endoscopy Society. 2016;28(1):3-15 #http://www.ncbi.nlm.nih.gov/pubmed/26234303.