1Saragoni L, Morgagni P, Gardini A, et al. Early gastric cancer: diagnosis, staging, and clinical impact. Evaluation of 530 patients [ J ]. New ele- ments for an updated definition and classification[ J]. Gastric Cancer, 2013,16(4) :549 -554.
2Min BH, Lee JH, Kim JJ, et al. Clinical outcomes of endoscopic submu- cosal dissection (ESD) for treating early gastric cancer: comparison with endoscopic mucosal resection after circumferential precutting (EMR-P) [ J ]. Dig Liver Dis, 2009,41 ( 3 ) : 201 - 209.