Department of Gastroenterology;
The Second Affiliated Hospital;
Xi’an Jiaotong University;
Xi’an 710004;
Shaanxi Province;
China;
Department of Gastroenterology;
Xi’an No.3 Hospital;
the Affiliated Hospital of Northwest University;
Xi’an 710018;
Shaanxi Province;
China;
State Key Laboratory of Cancer Biology;
National Clinical Research Center for Digestive Diseases and Xijing Hospital of Digestive Diseases;
Air Force Medical University;
Xi’an 710032;
Shaanxi Province;
China;