DepartmentofGastroenterology;
TheSecondHospital;
XianJiaotongUniversity;
Xi'an710004;
ShaanxiProvince;
China;
DepartmentofGastroenterology;
TheSecondHospital;
XianJiaotongUniversity;
Xi'an710004;
ShaanxiProvince;
China//DepartmentofGastroenterology;
ZhongshanHospital;
XiamenUniversity;
Xiamen361004;
FujianProvince;
China;