Safety analysis of laparoscopic endoscopic cooperative surgery versus endoscopic submucosal dissection for selected gastric gastrointestinal stromal tumors: a propensity score-matched study - Balde, A I; Chen, Tao; Hu, Yanfeng; Redondo N, J D; Liu, Hao; Gong, Wei; Yu, Jiang; Zhen, Li; Li, Guoxin (SURGICAL ENDOSCOPY AND OTHER INTERVENTIONAL TECHNIQUES, 2017)