DepartmentofGastroenterology;
theSecondHospital;
Xi'anJiaotongUniversity;
Xi'an710004;
ShaanxiProvince;
ChinaSupportedbyMinistryofHealthClinicalSubjectKeyProject;
No.20012130;
DepartmentofGastroenterology;
theSecondHospital;
Xi'anJiaotongUniversity;
Xi'an710004;
ShaanxiProvince;
ChinaSupportedbyMinistryofHealthClinicalSubjectKeyProject;
No.20012130;