Clinical outcomes of endoscopic versus laparoscopic resection for senile patients with gastric gastrointestinal stromal tumours (2 to 4 cm) originating from the muscularis propria layer - Xi Meng; Yun-Fei Hu; Xin-Li Mao; Hai-Hong Zheng; Shen-Kang Zhou; Yu Zhang (Gastroenterology Review)