Correction: Water exchange-assisted versus carbon dioxide-insufflated single-balloon enteroscopy: a randomized controlled trial - Liu, Shaopeng; Dong, Tao; Shi, Yupeng; Luo, Hui; Xue, Xianmin; Zhu, Yijin; Wang, Xiangping; Wang, Biaoluo; Liang, Shuhui; Pan, Yanglin; Guo, Xuegang; Wu, Kaichun (Endoscopy, 2021)