Department of Gastroenterology;
The First Affiliated Hospital of Xi'an Jiaotong University;
Xi'an 710061;
Shaanxi Province;
China;
Department of Digestive System Diseases;
Shaanxi Provincial Crops Hospital of Chinese People's Armed Police Force;
Xi'an 710054;
Shaanxi Province;
China;
State Key Laboratory of Cancer Biology;
National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases;
Fourth Military Medical University;
Xi'an 710032;
Shaanxi Province;
China;
Department of Health Statistics;
Second Military Medical University;
Shanghai 200433;
China;
Double-balloon; enteroscopy; Single-balloon; enteroscopy; Spiral; enteroscopy; Meta-analysis; Randomized; controlled; trials;