The First People''s Hospital of Yinchuan Yinchuan City 750001 Ningxia Province China;
The First People''s Hospital of Yinchuan Yinchuan City 750001 Ningxia Province China;
Affiliated Hospital of Ningxia Medical University Yinchuan City 750004 Ningxia Province China;
Colonoscopy; Fecal immunochemical test; Colorectal cancer screening;