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;