DepartmentofGeneralSurgery;
ShandongProvincialHospital;
ClinicalCollegeofShandongUniversity;
Jinan250021;
ShandongProvince;
China;
DepartmentofUltrasonography;
ShandongProvincialHospital;
ClinicalCollegeofShandongUniversity;
Jinan250021;
ShandongProvince;
China;
DepartmentofGeneralSurgery;
TongjiHospital;
HuazhongUniversityofScienceandTechnology;
Wuhan430030;
HubeiProvince;
China;