DepartmentofGastroenterologySurgeryandInstitutionofDigestiveSurgery;
WestChinaHospital;
SichuanUniversity;
Chengdu610041;
SichuanProvince;
China;
DepartmentofPathology;
WestChinaHospital;
SichuanUniversity;
Chengdu610041;
SichuanProvince;
China;