[1] Cent South Univ, Xiangya Hosp 2, Dept Geriatr Surg, Changsha 410011, Hunan, Peoples R China
[2] Cent South Univ, Xiangya Hosp 2, Dept Gen Surg, Changsha 410011, Hunan, Peoples R China
[3] Univ South China, Affiliated Hosp 7, Dept Gen Surg, Changsha 410119, Hunan, Peoples R China
[4] Cent South Univ, Xiangya Hosp 2, Dept Geriatr Surg, 139 Renmin Middle Rd, Changsha 410011, Hunan, Peoples R China