Affiliation: | Department of Anorectal Surgery, People’s Hospital of Hunan Province;the First Affiliated Hospital of Hunan Normal University;Department of Elderly Surgery, the Second Xiangya Hospital of Central South University;Department of Tumor Chemotherapy, Xiangya Hospital of Central South University;Department of Gastrointestinal Surgery, Hunan Provincial Tumor Hospital;theAffiliated Tumor Hospital of Central South University |