Departmentof Surgery;
the First Affiliated Hospital;
Sun Yat-sen University;
Guangzhou 510080;
Guangdong Province;
China;
Department of Gastroenterology;
theFirst Affiliated Hospital of Sun Yat-sen University;
Guangzhou510080;
Guangdong Province;
China;
Medical Research Center of GuangdongProvincial Hospital;
Guangzhou 510080;
Guangdong Province;
China;