DepartmentofGastroenterology;
TheSecondAffiliatedHospital;
SunYat-SenUniversity;
Guangzhou510120;
GuangdongProvince;
China;
TheThirdAffiliatedHospital;
SunYat-SenUniversity;
Guangzhou510100;
GuangdongProvince;
China;
DepartmentofGastroenterology;
TheFirstAffiliatedHospital;
SunYat-SenUniversity;
Guangzhou510089;
GuangdongProvince;
China;
DepartmentofGastroenterology;
TheFirstPeople'sHospitalofGuangzhouCity;
Guangzhou510033;
GuangdongProvince;
China;
DepartmentofGastroenterology;
PekingUnionMedicalCollegeHospital;
Beijing100730;
China;
DepartmentofGastroenterology;
TheFirstHospital;
BeijingUniversity;
Beijing100034;
China;
DepartmentofGastroenterology;
TheThirdHospital;
BeijingUniversity;
Beijing100083;
China;
DepartmentofGastroenterology;
BeijingFriendshipHospital;
CapitalUniversityofMedicalScience;
Beijing100050;
China;