Clinical outcomes and risk factors of non-curative endoscopic submucosal dissection for early gastric cancer: a retrospective multicenter study in Zhejiang, China oleh Chao-qiong Jin, Chao-qiong Jin, Jing Zhao, Xiao-yun Ding, Liang-liang Yu, Guo-liang Ye, Xin-jian Zhu, Jian-wei Shen, Ye Yang, Bo Jin, Chun-li Zhang, Bin Lv, Bin Lv